. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture -- Massachusetts. Left: Willow Flea Weevil. Greatly enlarged. Right: Willow Leaf Injured by Willow Flea Courtesy, Robley Nash. Life History. The adult weevils hibernate in the soil beneath trees, in sod, debris, under stone walls, and under loose bark or in cavities. About the time the willow buds open, the weevils go to the twigs and leaves and feed there until almost midsummer. Eggs are laid from the latter half of June until early July. The^' are inserted in the leaf tissue in cavities similar to feeding punct
. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture -- Massachusetts. Left: Willow Flea Weevil. Greatly enlarged. Right: Willow Leaf Injured by Willow Flea Courtesy, Robley Nash. Life History. The adult weevils hibernate in the soil beneath trees, in sod, debris, under stone walls, and under loose bark or in cavities. About the time the willow buds open, the weevils go to the twigs and leaves and feed there until almost midsummer. Eggs are laid from the latter half of June until early July. The^' are inserted in the leaf tissue in cavities similar to feeding punctures. In about 10 days the eggs hatch and the grubs proceed to make their blotch mines in the leaves. Later they pupate in these mines and in late August the weevils of the ricw' generation begin to appear and feed on the foliage until they go into their hibernating quarters in the fall. There is one complete generation a year. Control. In recent tests best results were obtained with a contact spray mixed in the proportion of 1 1/3 pints of nicotine sulfate plus 1 3/5 pints of liquid potash soap to 100 gallons of water. This should be applied twice: first, during the height of the egg-laying season to kill the adults and eggs; and again, about 3 weeks later, to kill the eggs and grubs in the new mines. Both surfaces of the leav'es should be sprayed. Because spraying often causes the adult weevils to drop from the foliage, the ground beneath the tree should also be thoroughly sprayed. Nash, R. \V. Jour. Econ. Ent. 27(2) :336-339. 1934. Weiss, H. B., and Lett, R. B. Psyche 28:152-155. 1921. Cottonwood Leaf Beetle Chrysoniela scripta Fabr. This insect is distributed over a large part of the United States. It is a serious pest of Cottonwood, poplar, and willow, especially in the Western States where it has caused serious defoliation of these trees. The larvae, or grubs, skeletonize the lower surfaces of the leaves. In New York State the insects have been known to. Please note that
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