. Cooperative economic insect report. Beneficial insects; Insect pests. - 749 - INSECTS NOT KNOWN TO OCCUR IN CONTINENTAL UNITED STATES NEW GUINEA SUGARCANE WEEVIL (Rhabdoscelus, obscurus (Boisduval)) Economic Importance: The weevil, described in 1835, is one of the more important pests of sugarcane in Hawaii. Formerly, it caused annual losses of over a half a million dollars in that State. After 1910, when the tachinid parasite Lixophaga sphenophori (Villeneuve) was introduced into Hawaii, losses were greatly reduced. Although the parasite was effective for a time in Fiji, it failed to contro
. Cooperative economic insect report. Beneficial insects; Insect pests. - 749 - INSECTS NOT KNOWN TO OCCUR IN CONTINENTAL UNITED STATES NEW GUINEA SUGARCANE WEEVIL (Rhabdoscelus, obscurus (Boisduval)) Economic Importance: The weevil, described in 1835, is one of the more important pests of sugarcane in Hawaii. Formerly, it caused annual losses of over a half a million dollars in that State. After 1910, when the tachinid parasite Lixophaga sphenophori (Villeneuve) was introduced into Hawaii, losses were greatly reduced. Although the parasite was effective for a time in Fiji, it failed to control Rhabdoscelus obscurus by 1935. Severe losses to sugarcane in Fiji have been re- corded. New Guinea sugarcane weevil mines the stems of healthy coconut trees and causes the clusters to fall. Distribution: Australia, Indonesia, Japan (in greenhouse), Taiwan, United States (noncontinental—Hawaii). Pacific Islands: American Samoa, Benin, Caroline, Christmas, Cook, Fiji, Gambler, Guam, Marshall, New Britain, New Caledonia, New Guinea, New Hebrides, Ryukyu, Solomon, Tahiti, Tonga, and Western Samoa. Hosts: Sugarcane, coconut, sago-palm, royal palm, toddy fishtail palm (Caryota urens) and _i V,_!i 1_,_A IV \ \ L_J i \ \ 1 1 I I I I I I- I: I L / / / I L I I I I I General distribution of (Rhabdoscelus obscurus (Boisduval)) Life History and Habits: The female, which may live for over a year deposits 600 or more eggs in small cavities drilled in the stalk. Eggs hatch in about 6 days and larvae bore into the stalk where they construct extensive tunnels. Nearly 80 days are required for larval growth but only 8-14 days are needed for the pupal stage. Pupation takes place in a cocoon which is located near an exit hole made by the larva. The adult remains in the cocoon for several days to harden. Coleoptera: Curculionidae No. 166 of Series. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and a
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