Kausalya, K G
(1994)
Insect- Host Plant-Parasitoid Interactions :
SORGHUM MIDGE Contarlnla sorghicola (Coqulllett).
PHD thesis, College of Agriculture, Rajendranagar.
Supervisors
| Supervisors Name | Supervisors ID |
|---|
| Nwanze, K G | UNSPECIFIED |
| Reddy, D D R | UNSPECIFIED |
Abstract
Three resistant (ICSV 745, ICSV 89058 and IS
10712) and three susceptible (Swarna, CSH 9 and ICSV 112) sorghum genotypes were
sown on three dates each during the rainy (6, 15 and 30 Jul in rainy season 1992 and
2, 19 Jul and 6 Aug in rainy season 1993) and post-rainy (29 Oct, 13 Nov and 1 Dec
1992) seasons of 1992193. A modified headcage was developed for easy and precise
collection of emerging insects. The species composition of natural enemies included three
larval parasitoids (Aprostocetus sp., Eupelmus sp. and Apanfeles sp.) and one predator
(Orius sp.). Parasitoid emergence commenced 1 - 3 weeks after initiation of midge
emergence. The population dynamics of Aprostocetus sp, was similar in susceptible and
resistant genotypes. Aprostocetus sp, activity was higher in the first and third sowing
dates than in the second and greater numbers were recovered from susceptible than from
resistant genotypes. The extent of parasitization of midge larvae did not follow a definite
pattern with resistance or susceptibility of the host plant to midge. The lowest levels of
parasitization were recorded from midge resistant ICSV 745. Studies on the tritrophic
interactions indicated variations in preference for host stage for parasitization and
development in rainy and post-rainy seasons
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