scholarly journals Laboratory Bioassay for Control of Fall Webworm, 1995

1996 ◽  
Vol 21 (1) ◽  
pp. 400-402
Author(s):  
D. Casey Sclar ◽  
Whitney S. Cranshaw ◽  
R. Jason Bishop
Keyword(s):  
Laboratory Bioassay ◽  
Fall Webworm

scholarly journals Comparison of two Neem Insecticides for Fall Webworm Control, Laboratory Bioassay 1992

1995 ◽  
Vol 20 (1) ◽  
pp. 328-328
Author(s):  
Whitney Cranshaw ◽  
Thomas B. Eckberg
Keyword(s):  
Larval Mortality ◽  
Control Laboratory ◽  
Laboratory Bioassay ◽  
Late Instar ◽  
Fall Webworm ◽  
Petri Dishes

Abstract Field collected late instar fall webworm larvae were divided into groups of ten and placed in petri dishes. Six groups (60 larvae) were used in each treatment. Chokecherry foliage was treated by dipping in the various solutions tested and allowing to air dry. On August 6, the larvae were fed the treated foliage for the first 3 days, and subsequently fed untreated foliage for the duration of the experiment. Larval mortality was assessed on August 10 (4 DAT), August 13 (7 DAT), and August 17 (11 DAT).

Plasticity of nutrient accumulation patterns in diapausing fall webworm pupae

2021 ◽  
pp. 1-8
Author(s):  
Lvquan Zhao ◽  
Wei Wang ◽  
Ying Qiu ◽  
Alex S. Torson
Keyword(s):  
The Body ◽  
Diapause Induction ◽  
Energy Reserve ◽  
Short Photoperiod ◽  
Induction Phase ◽  
Energy Reserves ◽  
Hyphantria Cunea ◽  
Survival And Reproduction ◽  
Fall Webworm ◽  
Diapause Incidence

Abstract The accumulation of nutrients during diapause preparation is crucial because any lack of nutrition will reduce the likelihood of insects completing diapause, thereby decreasing their chances of survival and reproduction. The fall webworm, Hyphantria cunea, diapause as overwintering pupae and their diapause incidence and diapause intensity are regulated by the photoperiod. In this study, we test the hypothesis that photoperiod influences energy reserve accumulation during diapause preparation in fall webworm. We found that the body size and mass, lipid and carbohydrate content of pupae with a short photoperiod during the diapause induction phase were significantly greater than those of pupae with a relatively short photoperiod, and the efficiency of converting digested food and ingested food into body matter was greater in the short-photoperiod diapause-destined larvae than the relatively short-photoperiod diapause-destined larvae. We also observed higher lipase and amylase activities in short-photoperiod diapause-destined larvae relative to the counterparts. However, no obvious difference was found in protein and protease in the pupae with a short photoperiod during the diapause induction phase and short-photoperiod diapause-destined larvae compared with the counterparts. Therefore, we conclude that the energy reserve patterns of diapausing fall webworm pupae are plastic and that short-photoperiod diapause-destined larvae increase their energy reserves by improving their feeding efficiency and increase their lipid and carbohydrate stores by increasing the lipase and amylase activities in the midgut.

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