2. Fruit fly

2. Fruit fly - Carpomyia vesuviana Costa. (Tephritidae: Diptera)
    Damage
    • The maggots bore into the pulp forming reddish brown galleries.
    • The infested fruits rot and turn dark brown and smell offensively.
    Bionomics
    • The adult fly is small, black spotted with banded wings.
    • It lays creamy white and spindle shaped eggs in cavities made on the fruits by ovipositor.
    • Fecundity of the insect is 22 eggs / female.
    • The incubation period is 2-3 days.
    • The maggots feed on the flesh of the fruit and fully grown in 7-10 days.
    • The maggot comes out of fruit by making 1-2 holes in the skin.
    • It pupates in soil for 14-30 days.
    Management
    • Remove and destruct the infested fruits from the ber orchard.
    • Incorporate lindane 1.3 % or chlorphyriphos 0.4 % dust 40 kg / hectare to the soil under the tree or near the trees to reduce the fruit fly incidence.
    • Cultivate fruit fly resistant varieties such as Safeda Illaichi, Chinese, Sanaur-1, Tikadi and Umran.
    • Collect and destroy fallen and infested fruits by dumping in a pit and covering with a thick layer of soil or incorporate lindane 1.3 D 30 g/tree.
    • Plough interspaces to expose pupae.
    • Encourage parasitoids Opius compensates and Spalangia philippinensis.
    • Use methyl eugenol lure trap (25/ha) to monitor and kill adults of fruit flies or prepare methyl engenol and malathion 50 EC mixture at 1:1 ratio and take 10 ml mixture/trap.
    • Use polythene bags fish meal trap with 5 g of wet fish meal + one ml dichlorvos soaked in cotton at 50 traps / ha. Fish meal and dichlorvos soaked cotton should be renewed once in 20 and 7 d respectively.
    • Use bait spray combining molasses or jaggery 10 g/ 1 and one of the insecticides, fenthion 100 EC 1 ml/1, malathion 50 EC 2 ml/1, dimethoate 30 EC 1 ml/1, carbaryl 50 WP 4g/1, two rounds at fortnight interval before ripening of the fruits.
    • Spray malathion 50 EC 2 ml/1 or dimethoate 30 EC 2 ml/1 or dichlorvos 0.1% at the time of flower formation and fruit set.

Last modified: Wednesday, 8 February 2012, 4:31 PM