The importance of Diopsis tenuipes Westwood as a pest of rice, based on a comparison of the egg-laying behaviour of D. tenuipes and D. thoracica Westwood
1974
Scheibelreiter, G., Commonwealth Institute of Biological Control,West Africa Sub-Station,P.O.Box3785,Kumasi(Ghana)
Field and laboratory investigations have shown that Diopsis tenuipes Westwood deposits eggs only on infested stalks, most of them on or near to the withering terminal leaf. When the larvae enter into the stalk, they compete successfully with the larvae of Diopsis thoracica Westwood which have already attacked the tillers and cause the damage known as the "dead heart" symptom. In such stalks, D. tenuipes significantly reduces the number of D. thoracica larvae present, eliminating them primarily through predation. Considering the fact that D. tenuipes only attacks already infested tillers and exerts a negative influence on the larvae of D. thoracica, one of the main pests of rice in Ghana, it can hardly be considered as a pest of rice any longer.
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