Abstract:

Linalool, Menthone, eugenol and Azadirachtin were tested on the Linalool, menthone, eugenol and azadirachtin were tested on the oviposition repellency effect on Conopomorpha sinensis indoor. The effect of the chemicals on the borer adult, egg hatching and pupa emergence were also studied. In the same concentration, the repellency effect sequence (from high to low) was eugenol> linalool> mint> azadirachtin. Experiments on the impact of the chemical on C. sinensis eggs showed that: 0.3% azadirachtin did not have suffocating effect on litchi fruit borer eggs, but had best contact toxicity. The other 3 compounds had both suffocating effect and contact toxicity effect. The egg mortality increased when the chemical concentration increased. Experiments on the pupae of C. sinensis showed that: pure compounds had significant effect on the pupa. After being treated with the pure compounds, the pupae cocoons immediately bulged, with the edge shrinking. Two days after treatment, the pupa became black, shrunk and died. But the diluted compounds had less effect on the pupae. The mortalities were only 20.00% to 26.70% after being treated with the diluted compounds. The results showed that linalool, menthol, eugenol and azadirachtin had certain inhibitory on the occurrence of different instars of C. sinensis had to some extent.