INFLUENCE OF INSECTICIDES - CYTOPLASMIC POLYHEDROSIS VIRUS COMBINATIONS ON PUPAL WEIGHT AND FECUNDITY OF TOBACCO BUDWORM (LEPIDOPTERA: NOCTUIDAE)

1989 ◽  
Vol 24 (4) ◽  
pp. 539-544 ◽  
Author(s):  
Abdul K. Mohamed ◽  
Jen-Rong Yang ◽  
Fred R. S. Nelson
Keyword(s):  
Heliothis Virescens ◽  
Methyl Parathion ◽  
Adult Emergence ◽  
Tobacco Budworm ◽  
Pupal Weight ◽  
Egg Hatch ◽  
Cytoplasmic Polyhedrosis Virus ◽  
Polyhedrosis Virus ◽  
Control Adult ◽  
Lepidoptera Noctuidae

Laboratory studies were conducted to determine the response of healthy and cytoplasmic polyhedrosis virus (CPV) infected Heliothis virescens (F.) larvae to LD50 of methomyl and methyl parathion. Methomyl-CPV combination adversely affected pupal weight and fecundity of the female. The effect of this interaction was synergistic. Exposure of CPV infected larvae to LD50 of methomyl resulted in a mean female pupal weight of 243 mg and a fecundity of 382 per female moth. These values were significantly lower than those of all other treatments. In contrast methyl parathion-CPV combinations did not result in a significant reduction in pupal weight as compared to the control. Adult emergence and egg hatch were not affected.

DIFFERENCE IN RADIOSENSITIVITY OF TWO COLONIES OF TOBACCO BUDWORMS, HELIOTHIS VIRESCENS (LEPIDOPTERA: NOCTUIDAE)

1972 ◽  
Vol 104 (7) ◽  
pp. 995-1002 ◽  
Author(s):  
F. I. Proshold ◽  
J. A. Bartell
Keyword(s):  
Gamma Irradiation ◽  
Heliothis Virescens ◽  
Wild Strain ◽  
Laboratory Strain ◽  
The Other ◽  
Tobacco Budworm ◽  
Female Progeny ◽  
Egg Hatch ◽  
Wild Strains ◽  
Lepidoptera Noctuidae

AbstractSterility induced by gamma irradiation of the adult male tobacco budworm, Heliothis virescens (F.), was studied in two colonies, one was reared in the laboratory for more than 60 generations (laboratory strain) and the other reared for fewer than 9 generations (wild strain). When irradiated males were crossed with untreated females, the percentage egg hatch for each dose was lower with the laboratory than with the wild strain. When laboratory and wild females were crossed reciprocally with irradiated males, the fertilities were similar to those of the laboratory and wild strains, respectively. When irradiated males were crossed with female progeny from reciprocal crosses, the percentage egg hatch was similar to that of the wild strain.Wild strain females were nearly monogamous for the first several generations, but F0 females mated nearly as frequently as females of the laboratory strain.

TOBACCO BUDWORM (LEPIDOPTERA: NOCTUIDAE): REPRODUCTIVE ABILITY OF STERILIZED AND NONSTERILIZED INSECTS OF A LABORATORY STRAIN AND A FIELD STRAIN AND DISTRIBUTION OF SPERM IN THE FEMALE

1978 ◽  
Vol 110 (11) ◽  
pp. 1121-1126 ◽  
Author(s):  
S. H. Robinson ◽  
D. A. Wolfenbarger
Keyword(s):  
Heliothis Virescens ◽  
Reproductive Tract ◽  
Laboratory Strain ◽  
Tobacco Budworm ◽  
Field Strain ◽  
Mating Frequency ◽  
Bursa Copulatrix ◽  
Egg Hatch ◽  
Reproductive Ability ◽  
Lepidoptera Noctuidae

AbstractCertain aspects of the reproductive ability of sterilized and unsterilized tobacco budworms, Heliothis virescens (F.), of a laboratory strain and a field strain, tested as single pairs, were studied; special attention was given to those females of pairs that mated but did not reproduce and to the distribution of sperm in the reproductive tract at various times after mating. Most of the sperm from the first two successful matings reached the spermatheca, but after three or more matings, substantial amounts were also present in the bursa copulatrix and(or) seminal duct. Ca. 18% and 35% of the unsterilized laboratory strain and field strain pairs, respectively, did not reproduce; 4.6% and 20.6%, respectively, locked or failed to mate. The percentage of mated pairs was reduced by the presence of a field strain female in crosses of the strains. Exposure to irradiation and chemosterilants reduced fertility but had little effect on mating frequency in either strain. Percentage egg hatch was the same for the untreated insects of both strains.

Effects of an Entomopathogenic Nematode and a Nuclear Polyhedrosis Virus on Emergence of Heliothis virescens (Lepidoptera: Noctuidae)

1995 ◽  
Vol 30 (2) ◽  
pp. 243-250 ◽  
Author(s):  
M. R. Bell
Keyword(s):  
Heliothis Virescens ◽  
Untreated Control ◽  
Helicoverpa Zea ◽  
Entomopathogenic Nematode ◽  
Adult Emergence ◽  
Similar Rate ◽  
Tobacco Budworm ◽  
Whitening Agent ◽  
Nuclear Polyhedrosis ◽  
Lepidoptera Noctuidae

Cage tests were conducted during the 1993 growing season to determine the effect of incorporating an entomopathogenic nematode (Steinernema riobravis) in soil under cotton on subsequent emergence of tobacco budworm, Heliothis virescens (L.). When soil under seedling cotton was treated with 240K nematodes per m2 on 13 May, the number of moths emerging in cages was reduced by an average of 66%, compared to the untreated control, for at least 21 days following application. When a similar rate was applied on soil under mature cotton on 12 July, the number of moths emerging in treated cages after developing as larvae on the plants was 57% less over a 39 d period compared to the untreated control. In another cage study, application of the nematodes on wild geranium, Geranium dissectum L., an early-season host of tobacco budworms and cotton bollworms, Helicoverpa zea (Boddie), reduced adult emergence by 36% compared to untreated areas, whereas a single application of baculovirus from the celery looper (600 billion polyhedra per ha) reduced the emergence by 56%. In this latter test, adult emergence was further reduced (73% less than control) when a whitening agent was added to the virus application. These studies indicate than an entomopathogenic nematode, and the use of a whitening agent with baculovirus, might be useful in tobacco budworm management programs.

scholarly journals Biological activities of spores and metabolites of some fungal isolates on certain aspects of the spiny bollworms Earias insulana (Boisd.) (Lepidoptera: Noctuidae)

2019 ◽  
Vol 29 (1) ◽  
Author(s):  
Eman Mohammed Abd-ElAzeem ◽  
Warda Ahmed Zaki El-Medany ◽  
Hend Mohammed Sabry
Keyword(s):  
Biological Activities ◽  
Larval Mortality ◽  
Adult Emergence ◽  
Pupal Weight ◽  
Earias Insulana ◽  
Dead Larva ◽  
Fungal Isolates ◽  
Protease Enzyme ◽  
Newly Hatched Larvae ◽  
Lepidoptera Noctuidae

AbstractBiological activities of spores and metabolites of some fungi isolated from dead larva of the spiny bollworms (SBW), Earias insulana (Boisd.) (Lepidoptera: Noctuidae), against the newly hatched larvae of the pest were carried out. Results showed that the fungi Metarhizium anisopliae, Acremonium sp., and Paecilomyces variotii had affected the newly hatched larvae of (SBW). Acremonium sp. was the most potent one as it had the highest newly hatched larval mortality percentage (65 and 58.33%) for its spore suspension and metabolites, respectively, while the lowest one (41%) was for P. variotii metabolites. Also, spore suspensions of the all fungal isolates had the highest larval mortality than fungal metabolites. Studying the enzymatic activity showed that Acremonium sp. produced protease enzyme on media containing gelatin, which caused the highest larval mortality (72.22%).These isolates showed different effects on all stages of the pest and decreased pupal weight, adult emergence percentages, deposited eggs, and hatchability percentages than the control. Identification of Acremonium sp. EZ1 was confirmed using 18 s rRNA and its accession number MN25101.

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