אסיף מאגר המחקר החקלאי

Oppositional responses to host density in Aphytis holoxanthus (Hymenoptera: Aphefinidae), an efficient gregarious parasite

Year:

1978

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Volume :

3

Co-Authors:

PODOLER, H., Hebrew University, Faculty of Agriculture, Rehovot, Israel
ROSEN, D., Hebrew University, Faculty of Agriculture, Rehovot, Israel
SHARONI, M., Hebrew University, Faculty of Agriculture, Rehovot, Israel

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Abstract:

Abstract. 1. Ovipositional responses of an efficient gregarious ectoparasite (Aphytis holoxanthus) to increasing densities of its host (the Florida red scale, Chrysomphalus aonidum, Homoptera: Diaspididae) were studied in a laboratory system. 2. The female parasite may lay one to several eggs at each encounter with a host. 3. As host density increased, the number of eggs laid by the female parasite during the experimental period increased at a decreasing rate. This type of functional response resulted in less parasitism at higher host densities. 4. As host density increased, the number of eggs laid per encounter decreased. This behavioural response partially compensated for the decrease in parasitism. Copyright © 1978, Wiley Blackwell. All rights reserved

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