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Cutworm, variegated

The quantity and quality of food in the diet on which insects are reared may affect their size and survival capacity. Variegated cutworm larvae fed peppermint leaves were more tolerant of the insecticides carbaryl, acephate, methomyl, and malathion than larvae fed snap bean leaves. Increased tolerance for carbaryl and methomyl was also observed in larvae of the alfalfa looper and cabbage looper when they were fed peppermint plants instead of their favored host plants alfalfa and broccoli. Furthermore, fall armyworm larvae fed corn leaves became less susceptible to the insecticides methomyl, acephate, methamido-phos, diazinon, trichlorfon, monocrotophos, permethrin, and cypermethrin than those fed soybean leaves. Although nutrition may play some role in these cases, it was found that enhanced insecticide tolerance caused by these host plants was mainly due to plant allelochemicals, which induced detoxification enzymes in the insects (Yu, 1986). [Pg.97]

Figure 9.16 Aldrin epoxidase activity of midgut microsomes of sixth instar variegated cutworm larvae after feeding on fresh leaves of peppermint or bean and on an artificial diet. Mean SE of two experiments. (From Yu, S.J., et al., Pcstic. Biochem. Physiol., 12, 280,1979. With permission.)... Figure 9.16 Aldrin epoxidase activity of midgut microsomes of sixth instar variegated cutworm larvae after feeding on fresh leaves of peppermint or bean and on an artificial diet. Mean SE of two experiments. (From Yu, S.J., et al., Pcstic. Biochem. Physiol., 12, 280,1979. With permission.)...
Table 9.15 Induction of microsomal aldrin epoxidase activity of variegated cutworm larvae fed secondary plant chemicals from peppermint... Table 9.15 Induction of microsomal aldrin epoxidase activity of variegated cutworm larvae fed secondary plant chemicals from peppermint...
Valsa canker. See Cytospora canker Variegated cutworm, 286 Vectors, 366-67 Vegetables, 245-47 Velvetbean caterpillars, viral pathogens for, 461 Veratrum, 472 Verbena. 247-48 Verbena, shrub. See Lantana Veronica. 248 Veronica incana, 248 VerticiUium.. 344... [Pg.532]

SATASOOK, C., ISMAN, M.B., WIRIYACHITRA, P., Toxicity of rocaglamide, an insecticidal natural product to the variegated cutworm, Peridroma saucia (Lepidoptera Noctuidae), Pestic. Scl, 1993,36,53-58. [Pg.160]

Petuniolide C (XVIII) was available in reasonable amounts, and we submitted samples of the compound elsewhere for tests upon other insects. The tobacco horn-worm (M. sexto) was susceptible to this compound in artificial diets (as might have been expected from early observations of larvae on the plant), with only 50% survival of animals to the prepupal stage at a dosage of 20 ppm (J. Oliver, personal communication). Another caterpillar, the variegated cutworm (Peridroma saucia Hubner), was... [Pg.219]

Some essential oils develop a combined activity on the insects, for example, EOs of Ocimum spp. exhibited both a repellent and a larvicidal action [45]. Acorus calamus EO and its active ingredients, asarone and its analogues, were both antifeedant and potent growth inhibitors to the variegated cutworm Peridroma saucia (Lepidoptera Noctuidae) [46]. It has also been shown that some essential oils exert quite opposite effects on different insect species. As an example, the tansy (Tanacetum vulgare L.) EOs impacted in different ways the following three beetles it was attractive and paralyzing for Rhizoperta dominica, repulsive for Tribolium confusum, and toxic for Sitophilus americana [47]. [Pg.4095]

In two bioassays, semiochemicals were applied first to the bottom and sides of glass scintillation vials, while in the second, an equivalent quantity was applied to the inside of the top of the vial. In both cases, the semiochemicals were applied in solvent, then the solvent was allowed to evaporate. Surfaces or lids of control vials were treated with solvent only. After the solvent had evaporated, five neonate larvae of the variegated cutworm, Peridroma saucia, were introduced into each vial for a 4-h exposure period. After exposure to the test chemicals, larvae were transferred to artificial diet, and their survival was assessed 24 h later. Because larvae could not climb the slippery surfaces of the glass vials and contact the... [Pg.259]


See other pages where Cutworm, variegated is mentioned: [Pg.187]    [Pg.192]    [Pg.286]    [Pg.286]    [Pg.316]    [Pg.479]    [Pg.336]   
See also in sourсe #XX -- [ Pg.316 , Pg.479 ]




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