Pest
Cyclamen mite
Phytonemus pallidusCyclamen mite is a microscopic tarsonemid mite that feeds in crowns, buds and unfolding leaves of cyclamen, strawberries and numerous ornamentals. Infested plants develop…
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Plant problem library
Detailed profiles of common plant diseases, pests, nutrient deficiencies and environmental problems.
Disease
Charcoal rot
Macrophomina phaseolina (Tassi) GoidanichCharcoal rot is a soilborne disease caused by the fungus Macrophomina phaseolina. It attacks roots, crowns and lower stems of many crops, with severe…
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Disease
Bacterial blight of geranium
Xanthomonas hortorum pv. pelargoniiBacterial blight of geranium is a destructive vascular and leaf-spot disease caused by Xanthomonas hortorum pv. pelargonii. It is commonly introduced in infected or…
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Disease
Septoria tritici blotch of wheat
Zymoseptoria triticiSeptoria tritici blotch is a foliar fungal disease of wheat caused by Zymoseptoria tritici. It begins as water-soaked or pale green flecks that enlarge…
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Disease
Zucchini yellow mosaic
Zucchini yellow mosaic virusZucchini yellow mosaic is a serious viral disease of squash and other cucurbits caused by zucchini yellow mosaic virus (ZYMV). In the United States,…
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Pest
Leopard moth
Zeuzera pyrinaLeopard moth, Zeuzera pyrina, is a wood-boring moth whose larvae tunnel inside the young branches and stems of many deciduous trees and shrubs. In…
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Pest
Apple Ermine Moth
Yponomeuta malinellusApple ermine moth, Yponomeuta malinellus, is a foliage-feeding moth pest of apple and crabapple trees. In spring, young caterpillars mine leaves and then feed…
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Disease
Xylella fastidiosa bacterial diseases
Xylella fastidiosaXylella fastidiosa is a xylem-limited bacterium responsible for several distinct plant diseases in the United States, including Pierce’s disease of grape, almond leaf scorch,…
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Pest
European shot-hole borer
Xyleborus dispar (Fabricius)The European shot-hole borer, Xyleborus dispar, is a small ambrosia beetle that tunnels into the sapwood and heartwood of stressed or recently injured trees.…
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Pest
Grapevine Fanleaf Nematode – Xiphinema index
Xiphinema indexXiphinema index is a microscopic, soil-dwelling plant-parasitic nematode that primarily damages grapevine root tips with its stylet. However, its main significance lies in its…
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Disease
Bacterial Leaf Streak of Small-Grain Cereals
Xanthomonas translucensBacterial leaf streak, also called black chaff when it affects wheat or barley heads, is a seed-associated bacterial disease caused by members of the…
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Disease
Tomato yellow leaf curl virus
Begomovirus coheniTomato yellow leaf curl virus (TYLCV) is a serious, whitefly-transmitted viral disease of tomato. Infected plants become stunted, with small, upward-curling leaves, strong crumpling,…
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