PJS Vol 131 No. 2, December 2002
Page 75-89
0031-7683
Life Table of Cotton Bollworm, Helicoverpa armigera Hubner (Lepidoptera: NoctuidaeJ) in Batac, Ilocos Norte, Philippines
Leonardo T. Pascua and Mirriam E. Pascua
Cotton Research Center
Cotton Development Administration, Batac, Ilocos Norte
College of Agriculture and Forestry
Mariano Marcos State University, Batac, Ilocos Norte
The mortality factors and reproductive potential of Helicoverpa armigera (Hubner) were determined in life table studies conducted at different growth stages of cotton under field and screen house conditions. High mortality rates of H. armigera were observed under field conditions and were increased from early squaring to bolling stage. The high mortality rates of eggs were caused by Trichogramma parasitization, and of larvae by disappearance (predation/ migration), disease, failure to pupate and Eriborus parasitization. Mortality rates of those reared in the screen house were minimal which were caused by infertility of eggs, inability to feed by newly-hatched larvae and larval disease. Because of high mortality of H. armigera in the field, intrinsic rate of increase (rm) ranged from 0.011 to 0.065 female/female/day which were much lower than those that were reared in the screen house (0.129 female/female/day). Eggs and early instar larvae were the most vulnerable stages.
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