Virus production and growth of bollworm and tobacco budworm on fruiting structures of cotton

M. I. Ali, S. Y. Young, Gary Felton

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Effects of cotton fruiting on bollworm, Helicoverpa zea (Boddie) and tobacco budworm, H. virescens (F.) larval growth, survivorship, length of pupal developmental period, pupal weight, susceptibility to H. zea nucleopolyhedrovirus (HzNPV) and production of virus in HzNPV-infected larvae were studied. Larval weight of both species after 10 days of rearing, varied significantly (P <0.05) and was in the order of artificial diet > flower-anthers > leaves > squares > sq. bracts. The length of larval developmental period, larval survivability, pupal weight and length of pupal developmental period was affected similarly. All of these were positively correlated with larval weight, except that the length of larval developmental period was negatively correlated. Mortality of HzNPV-treated bollworm or tobacco budworm larvae fed on square, sq. bracts and flower anthers ranged from 64.8 to 67.9% and 50.5 to 60.1%, respectively, and did not differ significantly among the tissues, indicating that dietary variation in cotton fruiting structures did not affect larval susceptibility to HzNPV. The number of viral occlusion bodies (OBs) produced by a larva fed square, sq. bracts or flower-anthers, respectively, were 2.0 X 10 7, 2.2 X 10 7 and 6.6 X 10 7 for bollworm and 2.0 X 10 7, 1.0 X 10 7, and 9.3 X 10 7 for tobacco budworm. In both species, larvae fed on flower-anthers produced significantly (P<0.05) higher number of OBs than those on squares or sq. bracts. In both species, the number of OBs produced by an infected larva fed different fruiting structures was positively correlated with the weight gained by a healthy larva fed on the same type of tissues. These results indicate that dietary variation in different reproductive structures of cotton directly affects bollworm and tobacco budworm larval growth and development, and indirectly affects the production of virus by HzNPV-infected larvae.

Original languageEnglish (US)
Title of host publication2000 Proceedings Cotton Conferences Volume 2
EditorsP Dugger, D Richter, P Dugger, D Richter
Pages1353-1356
Number of pages4
StatePublished - 2000
Event2000 Beltwide Cotton Conferences Volume 2 - Texas, United States
Duration: Jan 4 2000Jan 8 2000

Other

Other2000 Beltwide Cotton Conferences Volume 2
CountryUnited States
CityTexas
Period1/4/001/8/00

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)
  • Environmental Science(all)
  • Materials Science(all)

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