Bioefficiency of bermuda grass, Cynodon dactylon L., on the feeding activity of Schistocerca gregaria,forsk., orthoptera, acrididae,
2009
Mohamed, M.T.
The effects of Bermuda grass, Cynodon dactylone (L.) on approximate digestibility (AD), consumption index (CI), efficiency of conversion of ingested food (ECI) and digested food (ECD) into body substances as well as growth rate of the last nymphal instars of Schistocerca gregaria (Forsk.) were studied in the laboratory. The obtained results revealed that, feeding 4. h instar nymphs on the contaminated clover, Trifolium alexandrirum with leaves and roots extracts of burmuda grass in methanol, acetone and ethoxyethanol significantly reduced AD, ECI and ECD. The reductions in these parameters were expressed as remarkable reduction in the body weight of the treated 4. h instar nymphs. The same treatments were conducted against the 5. h instar nymphs and resulted in significant increasing in AD and CI, but ECI and ECD were decreased in comparison to the control. The decreasing in ECI and ECD was reflected as a reduction in the growth rate of the treated 5. h instar nymphs. It seems that, 5. h instar nymphs were more sensitive than 4. h one to the juvenilizing action of Bermuda grass because the increasing in AD and CI and the decreasing in ECI and ECD in the treated 5. h instar nymphs with the extracts of Bermuda grass are considered as a juvenilizing effect of this grass, which coinside with many other studies on plant extracts against insect pests. It is may refer to that Bermuda grass may include some effective compounds enable it to resist the desert locust plague.
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