Infestation of Liremyza sativae Blanchard and its control.
Liriomyza sativa has become a locally important pest insect of melons and vegetables since being found for the first time in 1993 in Sanya, Hainan, China. In Hainan, the pest can occur all the year round and produces 21-24 overlapping generations annually, with heavy infestation in winter and spring. Melons are more seriously damaged than vegetables, typically with 30-40% leaves damaged. The host range of the pest includes 69 species of plants belonging to 14 families. It is stated that the period when 2nd-instar larvae are most numerous and there is a crop damage rate of 10-20% was a suitable time for control of the insect. Spraying 40% omethoate at 100 ml/667 m2 with 25% Shachongshuang [the disodium salt of S,S′-[2-(dimethylamino)-1,3-propanediyl] thiosulfate] and a low dose of kerosene gave a 90% control of the insect.