Last edited by Niran
Monday, July 27, 2020 | History

3 edition of Alfalfa weevil and clover leaf weevil found in the catalog.

Alfalfa weevil and clover leaf weevil

C. A. Johansen

Alfalfa weevil and clover leaf weevil

by C. A. Johansen

  • 287 Want to read
  • 17 Currently reading

Published by Cooperative Extension, College of Agriculture, Washington State University in Pullman, Wash .
Written in English

    Subjects:
  • Alfalfa -- Diseases and pests,
  • Alfalfa weevil -- Control

  • Edition Notes

    Statement[Carl Johansen and Arthur H. Retan].
    SeriesInsect answers, Extension bulletin -- 0989., Extension bulletin (Washington State University. Cooperative Extension) -- 989.
    The Physical Object
    Pagination[2] p.
    ID Numbers
    Open LibraryOL17609325M
    OCLC/WorldCa41860491

    Alfalfa weevils can completely defoliate a field if infestation is high enough. Typically, the damaged leaf will appear to be a skeleton because the weevils will eat the leaf tissue but leave the veins intact. FACTORS TO CONSIDER. Though alfalfa weevils can cause great damage in a field, the extent of damage is based upon.   Alfalfa weevil is an important defoliating pest in alfalfa. Heavy infestations can reduce tonnage and forage quality. Adults feed on plants, but typically the larvae cause the majority of plant injury. Female alfalfa weevils can lay , eggs in a lifetime and insert at a time into alfalfa .

    alfalfa closeups; cover photo ; cow; inside cover Lanie Rhodes, Ohio State University and Authors. These views do not necessar-black stem, leaves; common leaf spot; 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;. The alfalfa weevil overwinters as an adult in leaf debris and soil where alfalfa is grown. They will surface early in the spring, usually once temperatures are 60 degrees Fahrenheit or higher and will immediately begin feeding off of the alfalfa leaves. The weevil will form round holes in the leaves they eat. This will continue for several weeks.

    Alfalfa weevil larvae (Image 1) may be confused with larvae of the clover leaf weevil (Image 2). Clover leaf weevil are much larger, have a light brown head, and often have the white stripe edged with pink. Clover leaf weevil larvae usually hide around the base of the plant during the day, feed mostly in lower leaves at night, and rarely cause. THE PEA LEAF WEEVIL an introduced pest of legumes in the Pacific Northwest By HUBERT W. PRESCOTT and MAX M. REEHER,^ entomologists, Entomology Research Division, Agricultural Research Service ^ The pea leaf weevil {Sitona Une- ata (L.)), long known as a pest of legumes in Europe, was first found.


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Alfalfa weevil and clover leaf weevil by C. A. Johansen Download PDF EPUB FB2

The clover leaf weevil is a pest of both clover and alfalfa. The clover leaf weevil larvae are approximately 1/2” long when fully mature. They are similar in appearance to the alfalfa weevil larvae but have a brown head capsule instead of a dark brown/black head capsule (Figure 3).

These larvae also feed on the lower leaves of the plant. Scouting Advised for Alfalfa and Clover Leaf Weevils. Ap Alfalfa weevils have been reported damaging alfalfa in north central Kansas and western Nebraska. As temperatures warm up, expect to see alfalfa weevil larvae in southern Nebraska and slightly later, in northern Nebraska.

Even with the pressure of planting row crops, it is. 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. A full-grown clover leaf weevil larva is longer (1/2 inch) and "fatter" than an alfalfa weevil larva. The head of a clover leaf weevil larva is light brown, and the white stripe along the back is bordered with light red or pink accents.

During the day, alfalfa weevil larvae usually are found on the plants, and clover leaf weevil larvae are. Clover Leaf Weevil Identification. The clover leaf weevil is a pest of both clover and alfalfa.

The clover leaf weevil larvae are approximately ½” long when fully mature. They are similar in appearance as the alfalfa weevil larvae, but have a brown head capsule instead of a dark brown/black head capsule.

These larvae also feed on the lower. Although the alfalfa weevil Hypera postica (Gyllenhal)] is an important alfalfa (Medicago sativa L.) pest, relatively little is known about how defoliation at specific plant developmental stages affects yield. This study was conducted to characterize yield responses of alfalfa to simulated alfalfa weevil injury when injury was initiated at the early bud stage of the first growth cycle and to.

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. Alfalfa weevil eggs are small and oval. They are pale yellow when fresh and become darker in color as they age.

They are usually placed in a Figure 5. The smaller larva is that of the alfalfa weevil, the larger, the clover leaf weevil larva (about 4 times life size). Figure 3. The alfalfa weevil; young adult at the left, Older adult at right.

Both and alfalfa weevil 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.

Sitona lineata. Pest description and crop damage Adults are grayish brown weevils about inch long with three faint stripes on the thorax. They appear in large numbers in spring and sometimes late summer. Adult feeding occasionally can cause substantial defoliation, which is.

Watch for plant damage in stubble fields that cannot be sampled with a sweep net. If there is weevil damage to an alfalfa stand, controlling the weevils and then allowing the plants to outgrow weevil damage before harvesting should help avoid yield losses from the damage.

PHOTO: Weevil damage results in yield and quality loss.The clover leaf weevil is green with a white stripe down the center of its back,but the white stripe is bordered with smudges of pink or red; the head of the clover leaf weevil is tan.

Adult clover leaf weevils are about two times larger than the alfalfa weevil (5/16 inch long), light brown, with a wide dark brown stripe on the back.