Effect of flooding on Malayan black bug (MBB) egg hatching and parasitoid emergence
1988
Parducho, M.A. | Arida, G.S. | Shepard, B.M. (International Rice Research Inst., Los Banos, Laguna (Philippines))
The MBB [Malayan black bug] Scotinophara coarcata lays its eggs at the base of rice plants. The effects of flooding on unparasitized eggs and eggs parasitized by Telenomus triptus were studied. To determine the effects of flooding on egg hatching, egg masses were put in test tubes filled with water for 0, 6, 12, 18, 24, and 36 h, in 10 replications. To determine the effects of subemergence on parasitoid emergence, freshly laid eggs of MBB were placed in a parasite colony for 24 h. After parasitoid oviposition, the eggs were submerged for 0, 2, 6, 12, 18, 24, and 36 h. When egg masses were not submerged, 96% hatched; none hatched after submergence for 24 h. When submerged 6, 12, and 18 h, only 33, 29 and 3% hatched, respectively. Unparasitized eggs submerged for 24 h did not hatch. However, more than 50% of the parasitoid emerged after 24 h submergence.
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