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Host specificity of cyrtobagous salviniae calder and sands coleoptera curculionidae introduced into india for the control of salvinia molesta



Host specificity of cyrtobagous salviniae calder and sands coleoptera curculionidae introduced into india for the control of salvinia molesta



Entomon 12(1): 1-6



The host-specificity of Cyrtobagous salviniae Calder et Sands (Col. Curculionidae), imported for biological control of the aquatic weed Salvinia molesta in India, was studied. Seventy five species of plants representing 41 families were tested. The weevil did not feed or reproduce on 67 of the test plants. Extremely limited feeding was observed on Amorphophallus sp., Colocasia esculenta, lpomaea betatas, Lactuca sativa and Raphanus sativus, with slightly more on Pistia stratiotes and Trapa bispinosa; but damage was negligible and no oviposition occurred on any of these plants. In the presence of Salvinia, none of the above plants were attacked, clearly showing that C. salviniae safe for introduction. Following these studies, C. salviniae was introduced into a lily pond at Bangalore and field releases were also initiated in Kerala. The weevil is now established as evidenced by the presence of all immature stages and freshly emerged adults.

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