Pest: Stemphylium Gray Leaf Spot of Tomato Gray leaf spot can be caused by several fungal species in the Stemphylium genus. Stemphylium solani and S. lycopersici are most common in North America, but S. botrysum also causes the disease. Gray leaf spot is typically considered to be most prevalent in humid tropical and subtropical regions,
Pest: Aphids Aphids are perhaps the soft-bodied insect pest most well-known to both farmers and gardeners. There are many different species of aphids, but green peach (Myzus persicae), melon (Aphis gossypii), potato (Macrosiphum euphorbiae), and foxglove (Aulacorthum solani) are the most common aphid species of concern in the Northeast. Some aphid species may have greater
By C.J. Walke, Orchard Program Manager Plum curculio (Conotrachelus nenuphar) is considered one of the most destructive insect pests in apple and plum orchards and has been referred to as the “Achilles’ heel” of organic orcharding because of the difficulty controlling this pest with cultural methods and materials approved by the Organic Materials Review Institute
Disease(s): Common Foliar Diseases of Alliums This fact sheet discusses botrytis leaf spot (Botrytis squamosa), purple blotch (Alternaria porri), stemphylium leaf blight (Stemphylium vesicarium) and downy mildew of onion (Peronospora destructor). These are the most commonly occurring foliar diseases of alliums in the Northeast, and many of their disease dynamics are closely linked; if one
Pest: White mold (Sclerotinia sclerotium) Pest/disease lifecycle, most common damage symptoms and crops affected: White mold (Sclerotinia sclerotium) is a widespread disease of over 300 species of plants. It is only a sporadic problem in “normal” and dry growing seasons; however, white mold can be very damaging in wet years and, if it goes unrecognized
Pest: Slugs and Snails Pest/disease identification and lifecycle, most common damage symptoms and crops affected: Land slugs and snails are closely related mollusks, known together as “gastropods,” the primary difference between them being that snails have external spiraling shells. There are over 90 terrestrial gastropods found in Maine. The gray garden slug is most common
Pest: Two-spotted spider mites (Tetryanchus urticae) Pest/disease identification and lifecycle, most common damage symptoms and crops affected: Two-spotted spider mites are the most common mite pest of crops in the Northeast. Because they thrive in hot and dry conditions, they are commonly found in greenhouses and high tunnels. Spider mites can feed on many crops
Pest: Mexican bean beetle (Epilachna varivestis) Pest/disease identification and lifecycle, most common damage symptoms and crops affected: If Mexican bean beetles have historically been a problem on your farm or in your garden, you will very likely see them again this year. They may be pests on snap beans, dry beans, soybeans and lima beans.
Pest: Tomato Brown Rugose Fruit Virus (ToBRFV) Disease identification: Tomato brown rugose fruit virus, otherwise referred to as ToBRFV, is a highly virulent and aggressive plant virus that can cause serious infections on tomato and pepper species. ToBRFV behaves very similarly to other tobamoviruses such as ToMV (tomato mosaic virus) and TMV (tobacco mosaic virus).
Pest: Allium Leafminer (Phytomyza gymnostoma) Pest/disease identification and lifecycle, most common damage symptoms and crops affected: Allium, or onion, leafminer (ALM) is an invasive pest of alliums. Adult allium leafminers are small (approximately 3 millimeters) gray/black flies with a distinctive orange/yellow spot on the tops of their heads, and yellow “knees” (Fig. 1). ALM have
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