Investigation on the Damage of Melon Fly in Sponge Gourd Garden and its Control Method
Min-Nan Fang and Chia-pao Chang
The melon fly,
Dacus cucurbitae Coquillett is an important insect pest of sponge gourd in Taiwan. The adults could lay their eggs on and cause damage in any stage of sponge gourd fruit before harvest. By using cue-lure + poisoned methyl eugenol (v/v=1:1) trap alone in the field could not reduce the percentage of infestation even as 32 traps were set in an area of 10 areas. Application of 25% Malathion W. P. or 40% Fenitrothion W. P. at a concentration of 0.25% at intervals of 7 days could reduce the damaged fruits to about 60 percent. No significant differences between the insecticidal treatments with or without protein hydrolysate were observed in this experiment. Covering the yound fruits with paper bags immediately after petal wilting showed the best method for protection the fruits from melon fly damage.