Factors affecting the cocoa pod borer, Conopomorpha cramerella (Snellen) (Lepidoptera:

مرکز و کتابخانه مطالعات اسلامی به زبان های اروپایی

منو

" Factors affecting the cocoa pod borer, Conopomorpha cramerella (Snellen) (Lepidoptera: "
A. B. Ismail G. E. Long

Document Type	:	Latin Dissertation
Language of Document	:	English
Record Number	:	1112628
Doc. No	:	TLpq304026561
Main Entry	:	A. B. Ismail
	:	G. E. Long
Title & Author	:	Factors affecting the cocoa pod borer, Conopomorpha cramerella (Snellen) (Lepidoptera:\ A. B. IsmailG. E. Long
College	:	Washington State University
Date	:	1992
student score	:	1992
Degree	:	Ph.D.
Page No	:	146
Abstract	:	This thesis describes aspects of the behavior of the cocoa pod borer (CPB), Conopomorpha cramerella (Snellen) and of a potential biological control agent, Trichogrammatoidea bactrae fumata Nagaraja (TBF), in the cocoa agroecosystem of Malaysia. The results showed that oviposition by female moths was not influenced by pod shape, color, or height in the tree. More pods and more eggs per pod were recorded on fan branches than on the main chupon. Survival of CPB eggs and mortality from parasitism by TBF were not significantly affected by pod height, shape or color. Older pods, those of ages 7 wk before ripening (WBR) or less were preferred for oviposition by CPB. No eggs were recorded on pods greater than 17 WBR. The proportion of eggs parasitized by TBF, egg loss and the degree of survival to larval emergence from the pod were independent of pod age. Egg parasitism and losses were low. Larval survival outside the sclerotic layer (SCL) was high and independent of pod age. Mortality of larvae at the SCL was higher in older pods. High larval density lowered the survival of larvae inside the pod. The dispersal behavior of TBF released in a cocoa field was investigated using traps of different colors and shapes. More TBF were caught on green traps than on yellow and more were caught on square than on cylindrical traps. Dispersal of TBF was initially limited around the release site but gradually distributed uniformly as time increased. Chemical field trials were conducted to determine the effects of cypermethrin and deltamethrin on parasitism of CPB by TBF. Cypermethrin resulted in higher TBF mortality (94.9 1.1%) than deltamethrin (88.3 1.7%). Older parasitized eggs were slightly tolerant to insecticides but TBF mortality was relatively high (>70%) regardless of the age of parasitized eggs. Cypermethrin reduced oviposition by both CPB and TBF and emergence of TBF up to twice as much as did deltamethrin.
Subject	:	Biological sciences
	:	Ecology
	:	Ecology
	:	Entomology
	:	Entomology
	:	Plant pathology