Zonate leaf spot, Leaf spot appears as concentric Use resistant varieties and clean, certified and No treatment threshold found. Phoma betae gray and brown rings of dead hot water treated seed. tissue and spores. These dead dry Ensure good soil drainage. copper oxychloride fungal patches or spots coalesce, Sanitation: Remove and destroy weeds and crop copper sulfate (basic) leading to leaf withering, and may residues at end of season. eventually kill the plants. Spores can lie dormant in the soil for several years, and can spread to many plants before discovered. PESTS AND DISEASES OF UKRAINE OILSEED CROPS: linseed/flaxseed, hemp seed, poppy seed Rape/Cabbage Bug, The rape bug is a pentagon-shaped Maintenance of crop rotation with spatial and No treatment threshold found. Eurydema insect, 5-7mm in length, that is temporal isolation of cruciferous crop oleracea black with three yellow or white plantations. mineral oil spots on the elytra (wings) and on Destruction of cruciferous weeds before their malathion the body margins. Eggs are flowering on fields, near fields, and on waste and laid in two neat rows grounds. of about 12 total, and nymphs are pale gray. Bugs feed by injecting enzymes which break down plant tissues to be sucked up. Feeding damage causes wounds through which plant pathongens can enter. Flax bollworm, Flax bollworms are large Choose flax varieties that are more resistant. No treatment threshold found. Heliothis ononis caterpillars, 12-20 cm long, Practice crop rotation. brown-green, with white stripes on Remove weeds in and around field. BT each side. They have stiff hairs on Careful monitoring for eggs and small larvae, each abdominal segment that treat before large numbers of larvae enter fruit, differentiate them from cutworms where they are protected from sprays, and armyworms. Adults are biocontrol agents Trichogramma parasitic cream-colored moths, 1.5-2 cm wasps and other natural enemies often destroy long with a brown inverted V stipe significant numbers of eggs, so monitor for
Zonate leaf spot, Phoma betae Leaf spot appears as concentric gray and brown rings of dead tissue and spores. These dead dry fungal patches or spots coalesce, leading to leaf withering, and may eventually kill the plants. Spores can lie dormant in the soil for several years, and can spread to many plants before discovered. Use resistant varieties and clean, certified and hot water treated seed. Ensure good soil drainage. Sanitation: Remove and destroy weeds and crop residues at end of season. No treatment threshold found. copper oxychloride copper sulfate (basic) PESTS AND DISEASES OF UKRAINE OILSEED CROPS: linseed/flaxseed, hemp seed, poppy seed Rape/Cabbage Bug, Eurydema oleracea The rape bug is a pentagon-shaped insect, 5-7mm in length, that is black with three yellow or white spots on the elytra (wings) and on the body margins. Eggs are and laid in two neat rows of about 12 total, and nymphs are pale gray. Bugs feed by injecting enzymes which break down plant tissues to be sucked up. Feeding damage causes wounds through which plant pathongens can enter. Maintenance of crop rotation with spatial and temporal isolation of cruciferous crop plantations. Destruction of cruciferous weeds before their flowering on fields, near fields, and on waste grounds. No treatment threshold found. mineral oil malathion Flax bollworm, Heliothis ononis Flax bollworms are large caterpillars, 12-20 cm long, brown-green, with white stripes on each side. They have stiff hairs on each abdominal segment that differentiate them from cutworms and armyworms. Adults are cream-colored moths, 1.5-2 cm long with a brown inverted V stipe Choose flax varieties that are more resistant. Practice crop rotation. Remove weeds in and around field. Careful monitoring for eggs and small larvae, treat before large numbers of larvae enter fruit, where they are protected from sprays, biocontrol agents Trichogramma parasitic wasps and other natural enemies often destroy significant numbers of eggs, so monitor for No treatment threshold found. BT
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