THE BEHAVIOR OF ADULT OF OSIER WEEVIL

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The behavior of adult of osier weevil

The behavior of osier weevil’s adult was studied at Lindian County in Heilongjiang Province in 1987–90. Osier weevil started emergence in the last ten days in July and peaked in the first and second ten days in August. Emergence on the susceptible species, such asPopulus berolinensis, is 5 to 10 days earlier than that on the species of pest-resistance such asP. xiaohei. The adult move slowly, and it spreads or distributes mainly by crawling or by carrying of human beings. Osier weevil has a selection on host species for intake nourishment. According to the degree of being addicted, the series can be arranged asPopulus herolinensis, Populus Staline, Populus pesudo simonii ×nigra,Populus xiaohei, Populus pachermis. The adult is likely to dwell on trunks and likely to eat slender and tender branches. Osier weevil makes a choice of host plants to lay eggs. The adult laid more eggs on theP. berolinensis than onP. xiaohei or willow. Most of the eggs laid on the young trees were distributed blow 2 m height. As tree’s age increase, the eggs’ spots get higher and higher. The eggs laid on the eastern and the southern sides of the trunk are more than that laid on the West and the North.P. berolinensis andP. Staline are the source trees of osier weevil in artificial stands in Western Heilongjiang. Cutting the pest source tree, planting pest-resistance species, strengthening the quarantine of the forest plants, and controlling of the diseases and pests timely have very important significance to prevent the occurrence and damage of this pest.