Papaya Fruit Fly

Disease

Papaya Fruit Fly

Toxotrypana curvicauda

insect

In a Nutshell

    Punctured fruit skin exudes drops of latex that clearly contrast with dark green colorLarvae dig tunnels through the pulp to reach the seed cavity and feed on the developing seedsThe extensive damage results in rotting of the fruit flesh and progressive decayThe fruit surface shows a yellow discoloration, and may appear scabbed or pitted

Hosts: %1$s

· Papaya

Symptoms

Females lay several eggs into very young or young fruits. The punctured skin exudes drops of latex that clearly contrast with dark green fruit coats. The larvae hatch and dig tunnels through the pulp to reach the seed cavity and feed on the developing seeds. Exit holes are clearly visible on the fruit surface. The extensive tunneling results in rotting of the flesh, reflected as brown and sometimes black lesions as it progressively decays. Fruits subsequently give off a foul odor and may ooze a juice-like substance. The skin turns yellow and may appear scabbed or pitted. The fruits ripen and can drop off prematurely.

Trigger

The symptoms are caused by the fly Toxotrypana curvicauda that lays its eggs into small green papaya fruits. Adults are commonly mistaken for wasps because of their size, color, and behavior. They have a yellowish body with black marks symmetrically placed on the thorax. Females have a long, narrow abdomen with a extended curved egg-laying organ that exceeds the length of the body. Larvae are white and slender, about 13-15 mm in length. Fruits may be infested with several larvae each and show symptoms post-harvest. Fruit damage is highest after the rainy season is over. The papaya fruit fly is a major pest in the the tropical and subtropical areas of the American continent.

Biological Control

The parasitic wasp Doryctobracon toxotrypanae may have potential for control.

Chemical Control

Always consider an integrated approach with preventive measures together with biological treatments if available. No insecticide seems to be effective against this fly. Traps containing an insecticide (e.g. malathion or deltamethrin) combined with a specific bait (for males or females) are being tested. Fruits can be treated with hot vapors of ethylene bromide to kill the papaya fruit fly.

Preventive Measures

    Monitor the damage or install pheromone traps to monitor fly populationUse paper bags to cover the fruits and hinder the laying of eggs (bagging)Rid the field of dropped and prematurely ripe fruitPick infested young fruits and destroy themUse trap crops around the field to attract the fliesHarvest earlier to avoid the worst damageStore fruits at temperatures between 13 and 16°CTilling around the trees kills the ground-developing adults before emergence




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