Onion thrips, Thrips are tiny, 1-2mm, dark Natural enemies such as minute pirate bugs, No reasonable treatment threshold Thrips tabaci slender insects with fringed wings, lacewing or predatory thrips control thrips in best seen with a hand lens. They the crop. Use seed treated with are seasonally transported Eliminate other host plants on or near the crop. thiamethoxam northwards from more-humid Sanitation: Remove and destroy infested crop coastal countries with the residues. garlic extract rain/wind storms. They feed by chili extract puncturing plant tissue and acetamiprid sucking out the cell contents. Nymphs and adults feed under leaf folds in protected inner leaves near the bulb. High populations of thrips can reduce both yield and storage quality of onions. Thrips are most damaging when they feed during the early bulbing stage of plant development. Bollworms, Bollworms are large caterpillars, Check for and conserve natural predators and No reasonable treatment threshold Helicoverpa armigera 3-4 cm long, brown-green, with parasites that can control large numbers of stripes on each side. They have Helicoverpa larvae. Use seed treated with stiff hairs on each abdominal Use insect pheromone traps near the field to thiamethoxam segment that differentiate them monitor for presence, to know when to monitor from cutworms and armyworms. for eggs. garlic extract Adults are brown moths, 1.5-2 cm Two weeks before planting, remove weeds and BT long. White eggs are laid in small grasses to destroy larvae and adults harboring spinosad groups on leaves. High in those weeds and grasses populations inflict significant Plow, disc and harrow fields at least two times damage, particularly during before sowing seeds to expose pupae to droughts, if larvae consume predators. flowers and pegs during podding. Sow seeds thinly and remove competing weeds Vigorously growing plants with to produce vigorous plants, which are more adequate available moisture are likely to withstand pests and diseases. better able to replace damaged Avoid planting crops successively that are hosts leaves and compensate for flower like corn, cotton, sorghum, tobacco and and pod damage. soybean.
Onion thrips, Thrips tabaci Thrips are tiny, 1-2mm, dark slender insects with fringed wings, best seen with a hand lens. They are seasonally transported northwards from more-humid coastal countries with the rain/wind storms. They feed by puncturing plant tissue and sucking out the cell contents. Nymphs and adults feed under leaf folds in protected inner leaves near the bulb. High populations of thrips can reduce both yield and storage quality of onions. Thrips are most damaging when they feed during the early bulbing stage of plant development. Natural enemies such as minute pirate bugs, lacewing or predatory thrips control thrips in the crop. Eliminate other host plants on or near the crop. Sanitation: Remove and destroy infested crop residues. No reasonable treatment threshold Use seed treated with thiamethoxam garlic extract chili extract acetamiprid Bollworms, Helicoverpa armigera Bollworms are large caterpillars, 3-4 cm long, brown-green, with stripes on each side. They have stiff hairs on each abdominal segment that differentiate them from cutworms and armyworms. Adults are brown moths, 1.5-2 cm long. White eggs are laid in small groups on leaves. High populations inflict significant damage, particularly during droughts, if larvae consume flowers and pegs during podding. Vigorously growing plants with adequate available moisture are better able to replace damaged leaves and compensate for flower and pod damage. Check for and conserve natural predators and parasites that can control large numbers of Helicoverpa larvae. Use insect pheromone traps near the field to monitor for presence, to know when to monitor for eggs. Two weeks before planting, remove weeds and grasses to destroy larvae and adults harboring in those weeds and grasses Plow, disc and harrow fields at least two times before sowing seeds to expose pupae to predators. Sow seeds thinly and remove competing weeds to produce vigorous plants, which are more likely to withstand pests and diseases. Avoid planting crops successively that are hosts like corn, cotton, sorghum, tobacco and soybean. No reasonable treatment threshold Use seed treated with thiamethoxam garlic extract BT spinosad
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