scholarly journals Parasitism of Helicoverpa assulta Guenee (Lepidoptera: Noctuidae) eggs by Trichogramma spp. (Hymenoptera: Trichogrammatidae): Implications for inundative release on tobacco plants

2006 ◽  
Vol 41 (4) ◽  
pp. 577-584 ◽  
Author(s):  
Maolin Hou ◽  
Fulian Wang ◽  
Fanghao Wan ◽  
Fan Zhang
Keyword(s):  
Tobacco Plants ◽  
Helicoverpa Assulta ◽  
Inundative Release ◽  
Lepidoptera Noctuidae

Effects of the sap of the common oleander Nerium indicum (Apocyanaceae) on male fertility and spermatogenesis in the oriental tobacco budworm Helicoverpa assulta (Lepidoptera, Noctuidae)

2001 ◽  
Vol 204 (22) ◽  
pp. 3935-3942 ◽  
Author(s):  
Seong Eun Jeong ◽  
Yun Lee ◽  
Jeong Hee Hwang ◽  
Douglas C. Knipple
Keyword(s):  
Male Fertility ◽  
Chemical Constituents ◽  
Direct Injection ◽  
Arginine Decarboxylase ◽  
Tobacco Budworm ◽  
Polyamine Metabolism ◽  
Helicoverpa Assulta ◽  
Continuous Feeding ◽  
The Common ◽  
Lepidoptera Noctuidae

SUMMARY We investigated the effects of sap of the common oleander Nerium indicum (Apocyanaceae) on male fertility and spermatogenesis in the oriental tobacco budworm Helicoverpa assulta. We found that continuous feeding of oleander sap during the larval period significantly affects fertility in males but not in females. This effect was also induced by direct injection of oleander sap into the hemocoel of 2-day-old pupae. Histological analyses of developing testes following oleander injection revealed a developmental delay and progressively more severe morphological abnormalities in the later stages of development. The effects of oleander sap on spermatogenesis in H. assulta were associated with greatly reduced levels of the two major polyamines, spermidine and spermine, in testis compared with saline-injected controls. In contrast, levels of putrescine, which is a precursor of both spermidine and spermine, and the activities of the enzymes ornithine decarboxylase and arginine decarboxylase, which are involved in the biosynthesis of putrescine, were initially elevated following oleander injection, but subsequently failed to undergo the induction that normally occurs during late pupal development. The effects of oleander sap on spermidine and spermine levels could be the result of direct inhibition by chemical constituents of the oleander sap of one of the enzymes used in common in the conversions of putrescine to spermidine and spermidine to spermine; alternatively, these effects on polyamine metabolism could be secondary to the disruption of a more fundamental process in the developmental program guiding spermatogenesis in H. assulta.

An odorant receptor and glomerulus responding to farnesene in Helicoverpa assulta (Lepidoptera: Noctuidae)

2019 ◽  
Vol 115 ◽  
pp. 103106 ◽  
Author(s):  
Han Wu ◽  
Rui-Ting Li ◽  
Jun-Feng Dong ◽  
Nan-Ji Jiang ◽  
Ling-Qiao Huang ◽  
...  
Keyword(s):  
Odorant Receptor ◽  
Helicoverpa Assulta ◽  
Lepidoptera Noctuidae

A receptor-neuron correlate for the detection of attractive plant volatiles in Helicoverpa assulta (Lepidoptera: Noctuidae)

2018 ◽  
Vol 97 ◽  
pp. 31-39 ◽  
Author(s):  
Wei-chan Cui ◽  
Bing Wang ◽  
Meng-bo Guo ◽  
Yang Liu ◽  
Emmanuelle Jacquin-Joly ◽  
...  
Keyword(s):  
Plant Volatiles ◽  
Receptor Neuron ◽  
Helicoverpa Assulta ◽  
Lepidoptera Noctuidae

CUTWORMS (LEPIDOPTERA: NOCTUIDAE) OF TOBACCO IN NOVA SCOTIA: II. FALL RYE AND WINTER FALLOW EFFECTS ON A FIELD POPULATION

1974 ◽  
Vol 106 (1) ◽  
pp. 73-77
Author(s):  
H. B. Specht
Keyword(s):  
Nova Scotia ◽  
Winter Rye ◽  
Tobacco Plants ◽  
Peridroma Saucia ◽  
Cultural Methods ◽  
Variegated Cutworm ◽  
Euxoa Messoria ◽  
Field Plots ◽  
Lepidoptera Noctuidae ◽  
Winter Fallow

AbstractTwice as many larvae of the dark-sided cutworm, Euxoa messoria Harr., were found in rye fall-seeded tobacco field plots than in winter-fallowed tobacco field plots. There were corresponding differences in numbers of injured tobacco plants. Cutworm aggregations were more prominent in the winter rye than in the winter fallowed area of the tobacco field with low populations of dark-sided cutworms.Larvae of the variegated cutworm, Peridroma saucia Hbn., appeared 2 to 4 weeks later than dark-sided cutworm larvae and winter cultural methods had little effect on their numbers.

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