A separate species of rice water weevil, Lissorhoptrus brevirostris is present in Cuba, Dominican Republic, Colombia, Suriname and Venezuela.
Lissorhoptrus oryzophilus began spreading through the rice growing regions of Asia in 1976 (China, India, Japan, Korea and Taiwan); in Europe it has been present in Italy since 2004, in the regions of the Piedmont and Lombardy where it affects upland rice production [1] The pearly white eggs are cylindrical (0.8 mm long and 0.14 mm long) of pearly with a very thin corion.
The larvae survive in the anoxic zone by using modified spiracles that are shaped as dorsal hooks connected to the tracheal system.
The adult undergo diapause during the winter from November through March at the foot of perennial grasses or under vegetative cover.
Adults are most active in the late afternoon or evening when temperatures are higher than 26 °C and wind speeds are less than 5 mph.
The best way to quantify populations of rice water weevil that can be directly related to yield losses is through soil coring (Way and Espino 2014).
Southern rice growers also use seed treatments with thiomethoxam (Cruiser) that also help In California, the best methods are treating field edges, rebuilding levees, winter flooding, and foliar spraying with pyrethroids such as lambda-cyhalothrin (Warrior) or neonicotinoids such as clothianidin (Belay).