Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

The Mango Weevil.

Abstract

The mango weevil (Cryptorrhynchus mangiferae, F.) is widely distributed in India, Ceylon, the Philippines, Madagascar, South Africa, Hawaii and elsewhere. A correspondent of the author's states that in Labuan only about 10 per cent. of the mangoes are edible, owing to the attacks of what is probably this species, and that the insect seems to be spreading there. From one stone two adult weevils were obtained, the pulp of the fruit being partially rotten, and in the side of the stone there was a hole with blackened edges, the contents of the seed being reduced to a black mass of frass. As Green has obtained a pupa from the stone, it is evident that in Ceylon the insect passes through all its stages-egg, larva and pupa-in the seed, though according to Lefroy, this insect in Florida pupates in the soil. As the weevils remain, even as adults, for a time in the seed, the former condition affords a better opportunity for their collection and destruction, but also increases the danger of the pest being distributed. Fumigation does not appear to be a certain method of killing the larvae in the seed, and therefore all fallen or infested fruit should be destroyed. The author also suggests that spraying at intervals with arsenate of lead (2 lb. to 50 gallons of water) would poison the weevils, which are not known to have any other food-plant.