scholarly journals Life Table Studies ofRachiplusia nu(Guenée) andChrysodeixis(=Pseudoplusia)Includens(Walker) (Lepidoptera: Noctuidae) on Artificial Diet

2012 ◽  
Vol 95 (4) ◽  
pp. 944-951 ◽  
Author(s):  
M. José Barrionuevo ◽  
M. Gabriela Murúa ◽  
Lucía Goane ◽  
Robert Meagher ◽  
Fernando Navarro
Keyword(s):  
Life Table ◽  
Artificial Diet ◽  
Pseudoplusia Includens ◽  
Lepidoptera Noctuidae

Intraspecific variation in the Chrysodeixis includens (Walker) (Lepidoptera: Noctuidae) susceptibility to insecticides

2021 ◽  
Vol 51 ◽  
Author(s):  
Samanta Souza Restelatto ◽  
Paulo Eduardo Wille ◽  
Nayara Buss ◽  
Cleiton Luis Wille ◽  
Mari Inês Carissimi Boff ◽  
...  
Keyword(s):  
Intraspecific Variation ◽  
Dose Response ◽  
Response Curve ◽  
Artificial Diet ◽  
Reference Population ◽  
Dose Response Curve ◽  
Yield Losses ◽  
Lepidoptera Noctuidae ◽  
Chrysodeixis Includens

ABSTRACT The looper caterpillar Chrysodeixis includens (Walker) is considered the main defoliating pest in soybean crops, which contributes to yield losses. Delaying its resistance to insecticides is a major challenge in its management. This study aimed to characterize the susceptibility of C. includens to flubendiamide, cyantraniliprole, spinetoram and methomyl, as well as to establish a diagnostic concentration for monitoring resistance. The insecticide was applied to the surface of the artificial diet. For the dose-response curve, concentrations that resulted in 5 to 99 % mortality were used to estimate the lethal concentrations (LC50 and LC99) and resistance ratios (RR50 and RR99). The diagnostic concentrations were based on concentrations that provided 90 to 99 % mortality in the susceptible reference population. For flubendiamide and methomyl, the decrease in the susceptibility resulted in estimated RR50 of 6.2 to 24.2 and 4.4 to 19.6 times, respectively. For cyantraniliprole and spinetoram, there was little difference in susceptibility among the populations, with RR99 lower than 6.1 times. Differences in the susceptibility of C. includens were evident from concentrations of 0.5053, 5.053, 0.1579 and 28.42 μg cm-2, respectively for flubendiamide, cyantraniliprole, spinetoram and methomyl.

The biology of the ectoparasitoid wasp Eulophus pennicornis (Hymenoptera: Eulophidae) on host larvae of the tomato moth, Lacanobia oleracea (Lepidoptera: Noctuidae)

1995 ◽  
Vol 85 (4) ◽  
pp. 507-513 ◽  
Author(s):  
G.C. Marris ◽  
J.P. Edwards
Keyword(s):  
Biological Control ◽  
Sex Ratio ◽  
Artificial Diet ◽  
Limited Range ◽  
Pest Species ◽  
Biological Control Agents ◽  
Biased Sex Ratio ◽  
Horticultural Pest ◽  
Lepidoptera Noctuidae

AbstractThere is a need to identify potential biological control agents for use against noctuid pests in greenhouses. The gregarious ectoparasitoid Eulophus pennicornis (Nees) attacks a limited range of macrolepidopterous larvae, including those of some important horticultural pest species. Laboratory trials designed to investigate the biology of E. pennicornis on larvae of the tomato moth, Lacanobia oleracea Linnaeus, reveal that wasps preferentially parasitize penulitmate (fifth) or final (sixth) instar hosts. More than two-thirds of wasps lay viable eggs, and individual females oviposit on up to four hosts during their lifespan. Wasp fecundity is high, preadult development is rapid, and offspring show a markedly female-biased sex ratio. Parasitized fifth instar L.oleracea hosts do not grow as quickly as unparasitized larvae, and neither do they undergo normal ecdysis to the final larval stadium. Furthermore, the consumption of artificial diet by parasitized fifth instar hosts is greatly reduced in comparison to that of unparasitized larvae (overall feeding-reduction over a 12 day period was 64.7%). Our results suggest that E. pennicornis affects both the developmental and feeding physiology of host larvae, and that inoculative releases of this parasitoid could provide effective biological control for L. oleracea and other greenhouse pests.

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