by Cooperative Extension, College of Agriculture, Washington State University in Pullman, Wash .
Written in English
|Statement||[Carl Johansen and Arthur H. Retan].|
|Series||Insect answers, Extension bulletin -- 0989., Extension bulletin (Washington State University. Cooperative Extension) -- 989.|
|The Physical Object|
The clover leaf weevil (Hypera punctata F.) is a sporadic but potentially serious pest of alfalfa (Medicago sativa L.). Feeding of newly emerged adult fourth instar clover leaf weevil was simulated Cited by: 1. Comparsion of alfalfa weevil to clover leaf weevil (Photo courtesy Oregon State University Extension) Alfalfa Weevil: Clover Leaf Weevil: Overwinter primarily as adults Adults are brown with a dark brown stripe halfway down the back, and 3/16 inch long Larvae prefer to feed on tips Larvae remain on the plant most of the time Larvae have black heads. To scout for clover leaf weevil, look in the debris around the crowns during day. Scratching in the soil around the crowns and counting the number of larvae found per crown will help give a better idea of clover leaf weevil infestation. Their brown heads will help distinguish them from the black-headed alfalfa weevil. Both the alfalfa and clover leaf weevils feed on first cutting alfalfa as larvae, and regrowth after the first cutting as adults (and sometimes larvae). While research in northeast Nebraska has shown that clover leaf weevil larva feeding does not cause yield reduction to first cutting alfalfa, alfalfa weevil feeding can cause severe losses to.
lepto leaf spot Marlin E. Rice, Iowa State University alfalfa weevil, blister beetles; clover leaf weevils; grasshopper; pea aphids; plant bug, adults; potato leafhopper, adult; spittlebug; variegated cutworm Judy A. Thies, USDA-ARS root-lesion nematodes John Wedberg, University of Wisconsin alfalfa blotch leafminer; clover root curculio, damage. Guide to identifying and managing alfalfa and clover leaf weevils in alfalfa. While research in northeast Nebraska has shown that clover leaf weevil larva feeding does not cause yield reduction to first cutting alfalfa, alfalfa weevil feeding can cause severe losses to yield and quality of the first cutting. This is why it's important to correctly identify the type of weevil feeding causing. It provides a good rule of thumb estimate for the alfalfa weevil’s pre-harvest damage potential. Collect 50 to alfalfa stems (10 to 20 randomly selected stems from five locations). Examine whether they show obvious feeding damage – pinhole or more severe feeding – in the rapidly growing tip leaves and leaf . Check Alfalfa for Weevil Damage. While everyone has been concentrating on getting corn and soybeans planted, don’t forget about alfalfa. There have been a few scattered reports of alfalfa weevil in alfalfa fields. I haven’t heard any reports on clover leaf weevils.
The alfalfa leaf-weevil (Phytonomus murinus Fab.) which has during the last three years been doing considerable damage in the central part of this State, is a European insect which by some means unknown has been introduced in to Utah. The species appears to be not uncommon throughout Europe and parts of Asia and Africa. It belongs to the large order of hard-shelled insects called beetles. The clover leaf weevil can generally be found throughout North America where alfalfa or clover is grown. The larvae feed on the foliage of host plants, resulting in leaves looking ragged and skeletonized. Table 1. Comparison of alfalfa weevil to clover leaf weevil: Alfalfa Weevil: Clover Leaf Weevil (Photo courtesy Oregon State University Extension) Overwinter primarily as adults Adults are brown with a dark brown stripe halfway down the back, and 3/16 inch long Larvae prefer to feed on tips Larvae remain on the plant most of the time Larvae. The clover leaf weevil, Hypera zoilus, is a co-occurring species that looks similar to alfalfa weevil. The clover leaf weevil adult, however, does not have the dorsal brown stripe and the larva has a brown head2 (Figure 3). The life cycle of alfalfa weevil in Maryland and states with similar climates usually consists of one full generation per.