Constraints on the use of Trichogramma Egg Parasitoids in Biological Control Programmes in India

Autor:	J. Romeis, T. G. Shanower, K. N. S. Jyothirmayi
Rok vydání:	1998
Předmět:	biology fungi Biological pest control Parasitism Hymenoptera Helicoverpa armigera biology.organism_classification Lepidoptera genitalia Toxicology Trichogrammatidae Insect Science Botany Noctuidae Agronomy and Crop Science Trichogramma
Zdroj:	Biocontrol Science and Technology. 8:289-299
ISSN:	1360-0478 0958-3157
DOI:	10.1080/09583159830351
Popis:	The use of Trichogramma (Hymenoptera: Trichogrammatidae) egg parasitoids for the biological control of several insect pests, including the pod borer Helicoverpa armigera (Hubner) (Lepidoptera: Noctuidae), is being promoted in India. Several companies supply these parasitoids to farmers, but no evaluation of product quality has been made. Low product quality is recognized as being one of the most important reasons for the failure of these biocontrol agents. In this study, Trichogramma chilonis Ishii egg-cards were obtained from eight producers in southern India. Product quality was evaluated using the following parameters: number of eggs/card, percentage parasitism, percentage emergence, progeny sex ratio and percentage of deformed females. In addition, producers were asked for the average values of these parameters in their production systems and for their recommendations for the use of T. chilonis to control H. armigera in cotton. The quality of the egg-cards was highly variable and was much lower than t...
Databáze:	OpenAIRE
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