![]() Commercial Vegetable Production in Wisconsin. Iowa State University, Department of Entomology.ħ Colquhoun, J., Gevens, A., Groves, R., Helder, D., Jensen, B. Cornell Cooperative Extension.Ħ The European corn borer. Cornell Integrated Crop and Pest Management Guidelines for Commercial Vegetable Production. ĥ Reiners, S., Wallace, J., Curtis, P., Helms, M., Landers, A., McGrath, M., Nault, B., and Seaman, A. University of Kentucky Cooperative Extension Service. Armyworm (beet armyworm Spodoptera exigua, western yellowstiped S. UC pest management guidelines: Dry beans. Armyworm feeding results in skeletonized leaves, with just the vein tissues remaining, and damaged pods with scars and holes.ġ University of Illinois Insect fact sheets. The adult yellowstriped armyworm moths are brownish gray with complicated patterns of light and dark markings and a wingspan of about 1½ inches (Figure 2). Western yellowstriped armyworm larva are 1½ to 2 inches long and black with prominent yellow stripes along their sides (Figure 1B). The adult beet armyworm moth is mottled gray/brown with a one inch wingspan. Their color can vary from olive green to black, and they have broad stripes along their sides with fine wavy white lines on their backs (Figure 1A). They have dark colored heads and four pairs of prolegs. 2,3īeet armyworm larva are 1¼ inches long when fully grown. 1 There are several species of armyworm that can feed on green beans, with the beet armyworm and yellowstriped armyworm typically being the most problematic. Do not exceed 1 lb ai/A per season.Armyworms get their name from the behavior of some species of armyworm of moving across fields in large numbers in an army-like fashion. methoxyfenozide (Intrepid 2F ) at 0.06 to 0.12 lb ai/A early season and 0.12 to 0.25 lb ai/A mid season and 0.16 to 0.25 lb ai/A late season.methomyl (Lannate SP ) at 0.45 to 0.9 lb ai/A.lambda-cyhalothrin (Warrior II ) at 0.02 to 0.03 lb ai/A.An oil or nonionic surfactant improves performance. gamma-cyhalothrin (Declare ) at 0.01 to 0.015 lb ai/A.cyfluthrin (Tombstone ) at 0.038 to 0.05 lb ai/A.Chromobacterium subtsugae (Grandevo ) at 0.3 to 0.9 lb ai/A per 100 gal.PHI 14 days of grazing 21 days harvest for dry lentils. carbaryl (Sevin 4F ) at 1 to 1.5 lb ai/A.bifenthrin/zeta-cypermethrin (Hero EW ) at 0.04 to 0.1 lb ai/A.Do not exceed 0.13 lb ai/A imidacloprid and 0.13 lb ai/A bifenthrin. bifenthrin/imidacloprid (Brigadier ) at 0.0875 lb ai/A.Do not exceed 0.1 lb ai/A per season as an at-plant application. bifenthrin (Capture LFR ) at 0.39 to 0.49 oz ai/1,000 ft row at planting.bifenthrin (Brigade 2EC ) at 0.033 to 0.1 lb ai/A.Do not exceed 0.05 lb ai/A beta-cyfluthrin or 0.1 lb ai/A imidacloprid per season. beta-cyfluthrin/imidacloprid (Leverage 360 ) at 0.056 to 0.066 lb ai/A.Do not feed treated vines or hay to livestock. beta-cyfluthrin (Baythroid XL ) at 0.019 to 0.025 lb ai/A.Some formulations OMRI-listed for organic use. Add an appropriate spreader-sticker to enhance control. Acts slowly may need multiple applications. Bacillus thuringiensis (Javelin ) at 0.12 to 1.5 lb/A.azadirachtin (Neemix 4.5 ) at 0.14 to 0.35 lb ai/A.PHI 1 day for succulent, 21 day for dried shelled lentils. alpha-cypermethrin (Fastac EC ) at 0.017 to 0.025 lb ai/A.Management-chemical control: COMMERCIAL USE spinosad-Some formulations are OMRI-listed for organic use.pyrethrins-Some formulations are OMRI-listed for organic use.)-Some formulations are OMRI-listed for organic use. plant-derived essential oils (rosemary, peppermint etc.capsaicin- Some formulations are OMRI-listed for organic use.kurstaki ( Btk ) -Some formulations are OMRI-listed for organic use. azadirachtin (neem oil )-Some formulations are OMRI-listed for organic use.Minimum preharvest interval (PHI ) varies with crop. Fall tillage can help destroy overwintering pupae.Īpply any one of these materials to the soil surface at first sign of cutworm activity. When infested alfalfa fields are mowed, large dispersions of armyworms also can take place. As weeds dry, large populations of armyworms can move onto crops. ![]() Lambsquarters and wild mustard attract egg-laying females and provide a source of food for larvae. None of these natural enemies can be counted upon to achieve adequate control in any given year. Pest monitoring Monitoring to catch infestations early is important, because Bacillus thuringiensis ( Bt ) insecticides work much more effectively on small larvae.Ĭommon natural enemies of armyworms include several braconid and ichneumonid wasps and many general predators, including assassin bugs, damsel bugs, spiders, and a nuclear polyhedrosis virus, reported to have brought about excellent late year control in Canada. Pest description, crop damage and life history
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