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The spraying of insecticides is the cheapest option available to growers. Host plant resistance has been investigated in rice but results have been less than desirable. Since the 1960s, out of 10,000 lines tested, only 2 showed moderate resistance to rice water weevil feeding.
Pittosporum eugenioides is only a host to the adult weevil as the larvae are hosted on different pittosporums. [16] Common garden pests can cover this plant, such as Aphids and blister scale (Psyilids). Both can easily be controlled and treated with an insecticide. The best time to spray as a preventative is February, then again in October. [13]
EPN is an insectide and an acaricide effective against orchard pests, including apple flea weevil, plum curculio, and codling moth and for some soil insects. It is also good to use against the following pests: rice stem borer, boll weevils, oriental fruit moth, fruit moths, codling moths, cotton bollworms, peachtree borers, pear psylla, aphids ...
Chemical management of annual bluegrass weevil is the most effective way to reduce the pest population. Preventive applications of insecticides, especially pyrethroids, should be timed with the local Forsythia bloom (half green/half gold)in order to cut the population before the first generation of eggs are laid for the year. [4]
Damage from Hypera postica, the alfalfa weevil, a serious introduced pest of forage, was substantially reduced by the introduction of natural enemies. 20 years after their introduction the population of weevils in the alfalfa area treated for alfalfa weevil in the Northeastern United States remained 75 percent down. [17]
A weevil's rostrum, or elongated snout, hosts chewing mouthparts instead of the piercing mouthparts that proboscis-possessing insects are known for. The mouthparts are often used to excavate tunnels into grains. [1] In more derived weevils, the rostrum has a groove in which the weevil can fold the first segment of its antennae.