Spanish bayonet (Yucca aloifolia) is a coastal plant, common in sand dunes in Gulf Coast states. Yuccas are elegant spiky-leaved plants which provide ornamental architecture to the landscape. Phyllosticta pad spot Lesions on pads of prickly pear cacti (Opuntia species) may be caused by several different pests or environmental conditions. Helminthosporium Leaf Spot. Reddish or light brown spots surrounded by a yellow halo may mean your dracaena has leaf spot disease. Spores from these fungi are spread in water splatters to the leaves, which is why overhead watering is not recommended. Southern blight is mostly visible on the stem but actually attacks the entire plant. Lesions turn yellow and finally brown as they mature. Care of the garden Lifestyle Plants Other Garden Practice Landscaping. Scale insects are sucking pests whose feeding causes damage to the leaves. Bacterial soft rot consists of a mushy rot on the bottom end of a cutting. Southern Blight. Bacteria are also present in overly moist environments. Leaf Spot Diseases of Yucca Both fungal and viral diseases may produce spots on yucca leaves. <>/XObject<>/ExtGState<>/Pattern<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/Annots[ 15 0 R] /MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S>> They prefer mostly full sun but can do well in partial shade. Photo by Jay W. Pscheidt, 2000. @�LA�В%D� ;�R��i�Ø�,E%AVo��f-�W����)�T�e_��s\Sg���RIy��;p,����1��'�������G=]F�F&���G�"���r2^�=+�����ۉM`�N�Gtv���V��ػHP���'�)K��O�S.�trR2K���Px^��y�;?J�O:��%�K�c6"^| �o��5>�K�Lj��#Z���i"S���>�Y����b2�c��X� ��R�ʩ��z��F�.qMp�tv�ٮ��(2J&���Hp6���ghJ�K_H�7�0��N��,Q�����P�b�V��e4)_�D+�fL7d���TAA����꘴�7Wm�*�u��E��d2�Ƣ���(�� Yellow or dead bands across leaves can indicate your plant got too cold. System insecticides also have good effect since the chemical is carried in the vascular system of the leaf and the insect sucks it out. Flowers are pollinated by the yucca moth so may need hand pollination to produce seed when planted in non-native areas. 4. Since that time, it has been found on many species of Dracaena. Use of a horticultural soap or simply a mixture of 1 pint water, 1 quart rubbing alcohol and a teaspoon of dish soap every week for a month, will also help contain any pests. Click on photo for more. Controlling this is as simple as removing the infected leaves. Diseases: May be affected by yucca leaf spot Cultivation: Grow in full sun with shelter from cold drying winds and in well-drained soil – it will grow well in open, rich loamy soil but tolerates poorer, sandier soil, and may withstand cold better when grown in poorer soil The attacking fungus or bacteria leaves small brown spots trimmed in yellow where it’s feeding on the leaves. Flowers are formed in large clusters, and often white. As is the case with every living creature, these beautiful trees too, are susceptible to a few harmful diseases and fungal infections that can kill it, or at least severely affect its life and growth. Cercospora, Cylindrosporium and Coniothyrium are the dominant suspects of yucca plant leaves with discolorations. However, the most common pad spot on the Engelmann’s prickly pear in the desert of Arizona is caused by a species of the fungus Phyllosticta. Aug 16, 2015 - Many ornamental and edible plants display dark, necrotic looking spots on their leaves. ����k�x���|*���OA�k�"'�����_Q$z}d�Ptd4��1��-�����Y�r\]����U� ��{A�x�9�o���y9YM��9���G��O��]UO��Ͼ���R+J��ˋ3�֨��lH�9�4MŇ�a�a����?�B$n����\������00��N�M\��ΨNV:�y��,t=�h�X@d8�+��䨺��+�[��Qw#g�����·18f�q�!S��y_���t,�n*�=���TyQIf��iL7�O�G����Y�p?�-D擖�2���uiF�g8� e�;��,v�Kf��Q#�� Cladosporium herbarum (formerly Mycosphaerella tassiana) has been reported from Washington, and Phaeosphaeriopsis obtusispora (formerly Paraphaeosphaeria obtusispora), which has a Coniothyrium anamorph, has been reported for both Oregon and Washington. Potential Cause 3: Leaf Spot Disease. Yucca spp. Yucca Plant With Rotting Stems. Apply water at the base of the plant and use a good sterilized potting soil that won’t carry spores or disease causing bacteria. Control of brown leaf spot includes the removal of all infected leaves and applications of a fungicide, such as Daconil 2787 or Zineb. Sneaky little insects are often the cause of a yucca plant with black spots. TWO LEAF SPOT DISEASES OF SPANISH BAYONET C. Wehlburg Spanish Bayonet, Yucca aloifolia L., is subject to two leaf spot diseases which are very common and so conspicuous as to attract the concerned attention of nurserymen and amateur gardeners alike. Cercospora, Cylindrosporium and Coniothyrium are the dominant suspects of yucca plant leaves with discolorations. It is an ornamental garden plant with medicinal properties (4). Yucca offers numerous health benefits and is often used medicinally. (previously classified as Helminthosporium fungi) that is active over a wide range of temperatures.At any given time of the year, at least one species within this fungal group can be isolated. For many diseases, this is because weather conditions are conducive to infection and the new foliage is most susceptible. It is a disease of many ornamental plants and can be spread in soil. Seed, Root cuttings Yucca-Leaf Spot. of Korea. Avoid using cold water (allow it to become room temperature before use e.g for orchids). Planting with Foresight Purchase resistant varieties of plants. Signs of the disease often appear within 72 hours. Tom Cole, head of horticulture and landscaping from Capel Manor College, advises us on the best way to deal with black spot leaf disease. Yucca Plants: Perfect Species for Inside and Outside Growing. A leaf spot disease of Yucca plants is prevalent in India. may be evergreen trees, shrubs, or perennials. Fiddleleaf philodendrons (P. bipennifolium) are no strangers to Pseudomonas chicorii leaf spot. Yucca plant bugs also feed by sucking the sap from the foliage. Coniothyrium bartholomaei, a fungus, has been found on yucca in Oregon. Rake up and destroy fallen leaves before the first snowfall to eliminate locations where diseases can … Treatment solutions are repetitive spraying, manual leaf washing and good soil management. Applications of copper fungicide are also recommended for fungal leaf spots. By: Bonnie L. Grant, Certified Urban Agriculturist. Brown leaf spot. Treat the yucca with a fungicide. Once leaves develop a thickened cuticle, they are more resistant. Brown leaf spot is the most common leaf spot disease found on yucca. 22 milliion acres of crops in the US are watered with overhesd sprinklers in the heat of the day and do not suffer from this form of irrigation. Common Names of Plant Diseases...A. R. Chase, primary collator (last update 3/26/93) ACANTHACEAE (Aphelandra squarrosa Nees, A [zebra plant] and Fittonia verschaffeltii (Lem.) Sign up for our newsletter. Once planted, the tag can be … Cause Coniothyrium bartholomaei, a fungus, has been found on yucca in Oregon. If you notice signs of the diseases, act quickly to minimize the spread of the issue and prevent major damage or death to the tree. Notice the dark spots on these leaves. Document Viewer Treat Cercospora leaf spot with fungicides that contain azoxystrobin, copper or myclobutanil. Note the dark fruiting bodies (pycnidia) in the center of the tan zone of this leaf spot. 3 0 obj However, it sets the stage for the more serious melting-out phase of the disease. Identification, prevention and cure. How to fight with problems as diseases and how to prune yucca tree Yucca plants: perfect species for Inside and outside growing and things you don’t know about yucca uses. In 2010, 100% of Y. filamentosa seedlings and plants were observed with a severe leaf spot disease in two ornamental nurseries lo … Brown Leaf Tips on a Yucca Tree. General care Pruning. Gray or brown spots on yucca leaves. Basically, the pest poisons itself during feeding and dies. Specific diseases. For many diseases, this is because weather conditions are conducive to infection and the new foliage is most susceptible. Yuccas, various species within the genus of the same name, are prized as perennials, shrubs or trees for their ability to tolerate drought and heat. Your yucca could even begin to have a rotten or fishy odor. They are native to the hot and dry er terminal spine. Once planted, the tag can be … Often a yellow halo is present. As a rule I hear the same everywhere – ‘yucca plants are easy to maintain, and that’s why I’ve chosen them.’ However, when it comes to reality, you should know the fact that they are also pretty susceptible to different problems, diseases … At the same time, all gray spots have characteristic brown edges. <> Yucca Leaf Spots; July 7, 2004: We tend to see fungal leaf spots and blights in spring and early summer. It is a disease of many ornamental plants and can be spread in soil. Potted plants are easier to manage than those in the ground. Read the following article to find out more about these diseases. P�����x��9�KУ&�A�пiAz��|o"O[�!�1M0�5����e1{b���ĔJ�xF��ɴ[%��|_��4$�~���eAm9�'�B���]���o���H��O⋼�+��`�"�74k#ι�O���z� ϭ���j%Œt0�]���y|M-Ib��P����R�����{�P9)�Ty�Rju7�0�L���������V �� ʖq�7'=*+/�{�fI��ak �} Optimum conditions for growth. Tar spot, a fungal leaf disease of corn, was discovered last week for the first time in Pennsylvania — in Lancaster County — reports Extension plant pathologist Alyssa Collins. In 2010, 100% of Y. filamentosa seedlings and plants were observed with a severe leaf spot disease in two ornamental nurseries located in the municipality of Viçosa, Minas Gerais, Brazil. Yucca-Leaf Spot. |Hban��D۳U?��V`�j2�}D�DU����j Coniothyrium leaf spot seems to be the most common of these. Since that time, it has been found on many species of Dracaena. "v�.�Yf0߉���ie�S����C���*�{�"�f�vX_����jZ)h��e�A�yb�����&��P&m��_�4"�v�v5�s�1e%/T���ex�sL�4I�V�.����0���$��WU9����|u�TF��t��/���P}�=���t�\VP]PnU���E_.f����ы�r�;{����U쮮n0�د�\�n&5�L^�b���H�{:�00 ^Н�u���C ��~m۶%�M�iM�-X�Ǭ��Xʂ��YȢ��Y$����j�ypSS�u__*dhơ�c����zQ@Ǘ�0���y�(x��?5�B�� ��'\����#�=��B}�if#1�����wi�R��kL2w�%� TWO LEAF SPOT DISEASES OF SPANISH BAYONET C. Wehlburg Spanish Bayonet, Yucca aloifolia L., is subject to two leaf spot diseases which are very common and so conspicuous as to attract the concerned attention of nurserymen and amateur gardeners alike. SYMPTOMS. <> Genus Yucca can be evergreen perennials, shrubs or trees, with dense or loose rosettes of stiff, sword-shaped leaves and tall panicles of bell-shaped flowers . These spots may vary in shape, color, and size. 4. Lesions are generally elliptical and scattered across the entire upper leaf surface. Yucca plant foliage is sensitive to overhead watering in warm, moist regions, which promotes fungal spore development. Details Y. filamentosa is a small stemless evergreen shrub forming clumps of sword-shaped, deep green leaves to 75cm in length, edged with curly filaments. Yucca-Leaf Spot. Learn more about bacterial leaf spot and its control in … Propagation. Sacc., Lesions are generally elliptical and scattered across the entire upper leaf surface. Spots on yucca leaves are primarily a visual distraction but in some cases can actually impose health problems as well. Leaf spot problems caused by fungal infections can ruin the appearance of yucca leaves and cause extensive plant damage if left unchecked. … It is a disease of many ornamental plants and can be spread in soil. Brown leaf spot caused by the fungus Coniothyrium concentricum (Desra.) Likewise, neem oil can be used. Southern blight is mostly visible on the stem but actually attacks the entire plant. Brown leaf spot caused by the fungus Coniothyrium concentricum (Desra.) Leaf tips are yellow or dead on "Janet Craig". The disease often causes spots on the leaves of your plant because spores from fungi thrive in the water on the yucca’s leaves. Yucca filamentosa L. (Agavaceae), commonly known as Adam's needle, is known in Brazil as "agulha-de-adão." Avoid using perlite, superphosphate, and other fluoride-containing soil amendments. SYMPTOMS. Research the type of tree or plant that … Their damage is yellowish-white, but the insects also deposit extract on the yucca foliage, leaving sticky black spots. and Yucca elephantipes were resistant. Brown leaf spot attacks the older leaves on your yucca plant. This is a symptom of bacterial leaf spot disease. LEARN MORE. Symptoms include grey spots and brown tips on the foliage. This disease is caused by ... Read Here. The symptoms of this disease are very noticeable, although they develop gradually: on the leaves there is either a point necrosis, or light spots appear on the edges of the leaves of the yucca. make a dramatic addition to the garden. SYMPTOMS. Symptoms: Coniothyrium-small spots start out purple but become zoned with a center that turns light grayish brown. Cercospora, Cylindrosporium and Coniothyrium are the dominant suspects of yucca plant leaves. Yucca plant: You will find The Ultimate Care Guide and why Your Yucca leaves curling. Leaf spot diseases will not seriously harm your plants, but there are things you can do that, when done together, can reduce the disease on the tree in following years. Leaves are fleshy or tough and long. Southern Blight. Leaf Spot Diseases of Yucca Both fungal and viral diseases may produce spots on yucca leaves. Yucca filamentosa L. (Agavaceae), commonly known as Adam's needle, is known in Brazil as "agulha-de-adão." 1) Coniothyrium or brown leaf spot (Coniothyrium concentricum) Symptoms - Coniothyrium leaf spot first appears as tiny clear zones in older leaves of yucca. Patchy or spotted gray areas found on the leaves of the yucca plant are most often a result of fungal disease. The disease will subsequently kill the leaf. Fusarium leaf spot of dracaenas was first described in 1940 on Sansevieria spp. Yucca leaves range in color from deep green to pale blue, and leaves may be striped in shades of white, cream, yellow, or chartreuse. The disease often causes spots on the leaves of your plant because spores from fungi thrive in the water on the yucca… For this reason, you should be extra careful not to overwater your yucca … Find more gardening information on Gardening Know How: Keep up to date with all that's happening in and around the garden. Fungal Disease: You can often spot a fungal disease by the effect it has on your yucca’s leaves. Your first line of defense against this disease is sanitation. Visible is the infestation of the widespread leaf spot disease on brown spots, which spread from the tips over the leaves. Once leaves develop a thickened cuticle, they are more resistant. Be certain to spray both the upper and lower surfaces of the leaf for good yucca black spot control. Yucca filamentosa L. (Agavaceae), commonly known as Adam's needle, is known in Brazil as “agulha-de-adão.” It is an ornamental garden plant with medicinal properties (4). Like any foliage plant, they can be damaged by fungus, bacterial and viral diseases and pest infestations. Pseudomonas Leaf Spot. In 2010, 100% of Y. filamentosa seedlings and plants were observed with a severe leaf spot disease in two ornamental nurseries located in the municipality of Viçosa, Minas Gerais, Brazil. 1) Coniothyrium or brown leaf spot (Coniothyrium concentricum) Symptoms - Coniothyrium leaf spot first appears as tiny clear zones in older leaves of yucca. Brown leaf spot is the most common leaf spot disease found on yucca. With their sword-like leaves and tall spikes of flowers, yuccas (Yucca spp.) In 2010, 100% of Y. filamentosa seedlings and plants were observed with a severe leaf spot disease in two ornamental nurseries lo … Management of these pests can be done by wiping leaves with a light alcohol solution or combating with pest spray formulated for these insects. Remove spent flower stalks. It is linked to high temperature and humidity. However, the most common pad spot on the Engelmann’s prickly pear in the desert of Arizona is caused by a species of the fungus Phyllosticta. Leaf spots multiply at the end of the growing season. Bacterial burn of yucca leaves is rare, but it can completely affect the entire plant. It is an ornamental garden plant with medicinal properties (4). Leaf spot or blight is a bacterial disease which causes dark lesions on the foliage. It is also known as brown leaf spot because the lesions turn brown. The pathogen is F. moniliforme and it causes leaf spots in the terminals of D. marginata. This disease is caused by ... Read Here. CARE AND PLANTING OF JOSHUA TREES - Star Nursery The Joshua Tree (Yucca brevifolia) tampering, and should be intact when you purchase the plant. Tan dead areas with bright yellow borders form along the leaf margin of "Massangeana" leaves. Additionally, insect feeding may cause a yucca plant with black spots. Leaf spot makes turf look sick, but does little permanent damage. The disease is found throughout the Fig. This disease is caused by a group of fungi (Bipolaris, Drechslera, and Exserohilum spp. It’s probably bacterial leaf spot, a disease, but could be an insect pest Spots On Yucca Leaves: Care For Yucca Plant With Black Spots It’s a myth that watering in the heat of the day burns foliage. Avoid using aerosols (leaf shine products or insecticide products). On Indian Hawthorn, blotches are typically bright red. Coniothyrium and Cytosporina fungi can be controlled with regular applications of a product that contains mancozeb, zineb or chlorothalonil. x��]Ys�F�~W���B݀סJ3�Z�ؖf&�>4� � ��!���oU8�ї�);"qdUeee~��U�|�����"ʓ�F�o�>Q … Leaf spot. Visible pests, damaged leaves, or stunted growth may indicate an infestation of thrips, shore flies, scales, mealybugs, or fungus gnats. Notice the dark spots on these leaves. Using stricter … Yucca Leaf Spots; July 7, 2004: We tend to see fungal leaf spots and blights in spring and early summer. Water in the morning so turf can dry out quickly. Yucca . Fusarium Leaf Spot Parts of the yucca plant can be incorporated into your diet. When yucca leaf tips dry out it is most likely that the yucca has not been watered … It can also be used topically to treat skin conditions or wounds. Leaf spot; Brown, yellow or black or water soaked spots will appear on the leaves. Your yucca could even begin to have a rotten or fishy odor. �W+����-�ov�97y"����M�I��U�;ݸ�D�f �FB&��~. The disease is mostly cosmetic, although if black leaf spot appears in consecutive years, trees can become weakened, making them vulnerable to other diseases and pest infestation. This helps prevent the spread of leaf spot spores. Leaf spot diseases are rarely harmful to redbuds, and fungicides are not usually recommended. Bottlebrush trees are considerably small tress which bear deep red, and sometimes pink flowers. Leaf spot or blight is a bacterial disease which causes dark lesions on the foliage. Home Cactus Care Cactus Pests Cactus Diseases Cactus Disorders Cactus Doctor Cactus Shop. This disease is mostly seen on dracaena. SYMPTOMS. ��uR�?`Z����f����h(f�uP��z��_�/k( ml�����/�Γ�B ��Qp;�9�vTIk4�}k'��ry�0�ݣ2Q顴�^ "���V��8��,`����뽧�N��+�������-vsJj����x*�Q��MB�g>��1B? Fungal Disease: You can often spot a fungal disease by the effect it has on your yucca’s leaves. Photo by Jay W. Pscheidt, 2000. The spread of the pathogen of this disease occurs when the humidity is … Document Viewer �D$r�(9c���$ML*����{���O���0Rq�Lތ.L��.d�j����"���������BzP#��(�R���r6�P��ݤ�F�����_�ϗī��U���XU�?�Z=MQ�ͷ�j�����h��Q*m�oc�[-i����dI��$S��҆q�賳U:V&r�� �oG��>8�(�+D㐍l���n+��u9]l%Չ[o�BP��Ɔj��-\��&}�ZEB�G"�Ij"#�zÉ�^��w��d�J)�t���}�DB��b�S�@,`ȣy��ɿ����H�-z�� ��u���+U"ۨ4��ȕ�If��T,M�L�a���f*��>��X����RGP���nX Howard F. Schwartz, Colorado State University, Bugwood.org, What Is Horticultural Soap: Information On Commercial and Homemade Soap Spray For Plants, Yucca Plant Bugs: Learn How To Treat Insects That Affect Yuccas, Carrot Leaf Spot Treatment: Learn About Cercospora Leaf Blight In Carrots, Different Dieffenbachia Varieties – Different Types Of Dieffenbachia, Citronella As A Houseplant – Can You Keep Mosquito Plant Citronella Indoors, Houseplant Placement – Houseplants And Where To Put Them. ... Black Leaf Spot on Yucca. Gray leaf spot. Small spots may coalesce to form large purple to maroon blotches on heavily diseased leaves. They are native to the hot and dry er terminal spine. When it comes to the palm leaf or the yukka palm - care, cutting, yellow leaves and other related questions, you will find here many tips and information. If you see small brown spots trimmed in yellow, your plant might have a Leaf Spot Disease. endobj They are also used in pharmaceutical industries for Spots are initially water-soaked … Dried out leaf tips. Fusarium leaf spot of dracaenas was first described in 1940 on Sansevieria spp. As with fungal spots, neem oil can also be used. Pests and Diseases of Cacti and other succulent plants. Leaf Spot Diseases of Yucca Both fungal and viral diseases may produce spots on yucca leaves. Spots, or lesions, are yellow or brown and they may take on a sunken appearance. Other fungal pathogens can be identified by a floury-gray coating, such as powdery mildew. Managing Dracaena Disease Problems Excess fluoride: Maintain soil pH between 6 and 6.5. Propagation methods. Bacterial leaf spot or blight is common on many ornamental plants. Learning to identify and treat these diseases can help your yucca get back to good health. <> Bacterial soft rot consists of a mushy rot on the bottom end of a cutting. Yucca . endobj Yucca Fungus. In severe cases, the leaves change color, wither and can drop prematurely from the tree. Spanish Bayonet, Yucca aloifolia L., is subject to two leaf spot diseases which are very common and so conspicuous as to attract the concerned attention of nurserymen and amateur gardeners alike. Poor air circulation will also cause the problem. Brown leaf spot and necrosis was observed on pendulous yucca in house gardens. Yellow yucca leaves can also be caused by a lack of direct sunlight. 4 0 obj Agave and yucca plants do well in well-drained soil with little water. 2 0 obj Control: Treat fungal diseases with approved fungicides. Cutting off the foliage is the first line of defense. Do not irrigate with water containing 1 ppm fluoride. %���� ... Generally, weather or irrigation that keeps leaves wet for extended periods favors the disease. =��k$�����g�:��tf�L/��8�H�'�%Y�!w#�S>���D+���@����$�A�%>�]�J�������J ��d�fN�^ \G?T���Q�A�ɿ��6� %PDF-1.5 CARE AND PLANTING OF JOSHUA TREES - Star Nursery The Joshua Tree (Yucca brevifolia) tampering, and should be intact when you purchase the plant. ... Generally, weather or irrigation that keeps leaves wet for extended periods favors the disease. Leaf spot or blight is a bacterial disease which causes dark lesions on the foliage. Generally, weather or irrigation that keeps leaves wet for extended periods favors the disease. Taking care to avoid black spots on yucca will keep your plant looking its best year round. Phyllosticta pad spot Lesions on pads of prickly pear cacti (Opuntia species) may be caused by several different pests or environmental conditions. LEARN MORE. Can An Overwatered Christmas Cactus Plant Be Saved? stream Note the dark fruiting bodies (pycnidia) in the center of the tan zone of this leaf spot. Spray in spring with an ornamental fungicide to prevent spores from forming and destroying yucca plant leaves anew. Aloe barbadensis (A. vera), Beaucarnea recurvata, Chlorophytum comosum, Ophiopogon sp. Black spots on yucca may be caused by any of these problems. Yucca leaves range in color from deep green to pale blue, and leaves may be striped in shades of white, cream, yellow, or chartreuse. Sacc., A leaf spot disease of Yucca plants is prevalent in India. They need to be allowed to dry out for a week or more between watering. The first signs of Entomosporium leaf spot disease are tiny, circular, often bright red spots on both surfaces of young expanding leaves. The spots can become quite large, up to 3 inches wide. Overwatering and wet foliage causes more fungal problems, as the fungus requires moist conditions to grow. The genus Yucca contains several plants commonly used as landscape ornamentals in U.S. Department of Agriculture plant hardiness zones 4 through 11. �Eg�T���r�Ԝvi��ւ��^Q�WԘe0{$����i�+�� 1 0 obj Pale coloured spots may also develop if plants have too much sun or from aerosol damage on exposed surfaces. The insect cycle requires many applications throughout the season for good control. endobj Lesions turn yellow and finally brown as they mature. Spanish Bayonet, Yucca aloifolia L., is subject to two leaf spot diseases which are very common and so conspicuous as to attract the concerned attention of nurserymen and amateur gardeners alike. see more; Family Asparagaceae . on Yucca. Keeping your redbud tree healthy and strong can prevent it from falling victim to diseases and fungus. This disease, also called grey leaf spot, is another fungal disease caused by Cytosporina. Introduction. It will further cause brown dusting on the leaves as well as blooms. Cucumber Hollow Heart: Reasons For Cucumber Hollow In Middle, Cucumber With Holes: What Causes Holes In Cucumbers, Algae On Seed Soil Surface: How To Get Rid Of Algae On Seeding Soil, Dream Garden Improvement - Back To Nature, Propagating Houseplants 101: Tips For Propagating Plants, Sprengeri Fern Plant: Growing Houseplants As Family Heirlooms. Apply fungicides according to manufacturer's instructions. Sign up to get all the latest gardening tips! Like brown leaf spot, tip necrosis affects older … Generally, weather or irrigation that … Both fungal and viral diseases may produce spots on yucca leaves. This spreads further, deprives the leaves of life, so that it turns yellow and dies. With this disease, small spots appear on the yucca, which at first have a yellowish color, but eventually turn black. Spores from these fungi are spread in water splatters to the leaves, which is why overhead watering is not recommended. Melting out occurs in hot weather and can be easily confused with drought stress or insect damage. We will investigate each possibility to see if the cause can be narrowed down. The disease is found throughout the Fig.