diel activity cycle of the adult alfalfa weevil, Hypera postica (Guill.), in Oregon by Roderick Ward Warner

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Statementby Roderick Ward Warner.
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Pagination[10], 128 leaves, bound :
Number of Pages128
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Download diel activity cycle of the adult alfalfa weevil, Hypera postica (Guill.), in Oregon

Abstract. Diel fluctuations in the abundance of adult Hypera postica (Gyllenhal) as measured by sweeping, were studied in 3 regions of Oregom. The peak activity of new generation adults in the summer was after dark in all regions. A high postive correlation to Author: Roderick W.

Warner, Paul O. Ritcher. The diel fluctuations in the abundance of alfalfa weevils, as measured by sweeping, were studied during and in three of the four major alfalfa growing regions of Oregon.

It was found that in all regions studied significantly more new generation adults could be captured after dark than during the day in the : Roderick Ward Warner.

Diel fluctuations in the abundance of adult Hypera postica (Gyllenhal) as measured by sweeping, were studied in 3 regions of Oregom. The peak activity of new generation adults in the summer was after dark in all regions. A high postive correlation to temperature was also noted at : Roderick W.

Warner, Paul O. Ritcher. Diel fluctuations in the abundance of adults of Hypera postica (Gylh.) as measured by sweeping in lucerne fields were studied in three regions of Oregon. The peak activity of new-generation adults in summer was after dark in all regions. A high positive correlation with Author: Roderick W.

Warner, Paul O. Ritcher. Graduation date: The diel fluctuations in the abundance of alfalfa weevils, as\ud measured by sweeping, were studied during and in three\ud of the four major alfalfa growing.

Hypera postica (Gyllenhal) (Curculionidae), the Alfalfa Weevil. Hypera postica was first found in the United States near Salt Lake City, Utah, inprobably an accidental introduction from Europe (Titus,).

The weevil was confined to 12 western states untilwhen it was detected in Maryland (Bissell, ). From Maryland, it. Alfalfa Weevil(Hypera postica Gyllenahl) Insect Fact Sheet integrated pest management Description Life Cycle Injury Alfalfa weevil adults are small (1/4 inch) brown snout beetles that have a distinctive dark, narrow stripe which extends down their back.

Adult weevils insert yellow oval eggs into alfalfa. The following is virtually the author's abstract. At Auburn, Alabama, larvae of Hypera variabilis[Hypera postica] (Hbst.) (postica (Gylh.)) were found in lucerne fields during each month of the year inbut most abundantly from late March until mid-April.

Larval activity was not influenced by time of day, but the adult weevils were much more active at night than during by: 2. For alfalfa growers throughout the United States—and particularly in the western states—the alfalfa weevil (Hypera postica) is a major concern, as damage from infestations lead to decreased yield and quality.A new resource published today in the open-access Journal of Integrated Pest Management offers growers a robust profile of alfalfa weevil and various options for managing it.

Regrowth damaged by adult weevils. Close-up of adult weevil 'debarking' damage. Spray gallonage for ground equipment: 10 to 12 gallons per acre for 7-inch alfalfa; 15 to 20 gallons for 8- to inch alfalfa; at least 20 gallons per acre on alfalfa more than 15.

THE DIEL ACTIVITY CYCLE OF THE ADULT ALFALFA WEEVIL, HYPERA POSTICA (GUILL.), IN OREGON INTRODUCTION The alfalfa weevil, Hypera postica, has been present in Oregon since 19 19 and is now spread over most of the alfalfa producing areas of the state (Ritcher, ), Although figures as to the economic.

Occurrence of adult alfalfa weevil, Hypera postica Gyllenhal, was observed at Chinese milk vetch field, and host plant preference of its generation adult was observed at greenhouse and Chinese. The alfalfa weevil, Hypera postica (Gyllenhal), undergoes aestivation as an adult in South Carolina.

The dormant period lasts roughly from July to October and pre- sumably represents an adaptive mechanism for survival during the hot by: 3. The alfalfa weevil spends the winter as an adult in the crowns of the alfalfa plant or under leaves or other debris.

Adult weevils are small, 1/4-inch, brownish-grey snout beetles, with a darker brown band down the back. Another weevil that can be confused with the alfalfa weevil is the clover root curculio or Sitona Size: 1MB. Hypera postica, commonly known as the alfalfa weevil, is a species of beetle in the superfamily Curculionoidea; it can be found in alfalfa fields throughout Europe.

Considered a destructive threat to alfalfa production in North America, several accidental introductions have been successfully countered though the use of a variety of biological control speciesClass: Insecta.

Hobbs GA, Numni WO, Virostek JF, History of the alfalfa weevil, Hypera postica (Gyll.)(Coleoptera: Curculionidae), in Alberta. Canadian Entomologist, Hodjat SH, The effect of insecticides on alfalfa weevil (Hypera postica Gyll.) when sprayed by turbair X and a hand sprayer.

Journal of the Entomological Society of Iran. Alfalfa weevil, Hypera postica (Gyllenhall) (Coleoptera: Curculionidae), is of Eurasian origin. This destructive pest of alfalfa (lucerne) was accidentally established in North America on three separate occasions.

These introductions are commonly identified in the literature as biological strains: western alfalfa weevil, Egyptian alfalfa weevil (=Hypera brunneipennis Boheman), and eastern Cited by: Alfalfa weevil activity can be predicted with the use of degree-days.

Beginning January 1, the accumulations of degree-days (base 48°F), can be used to estimate alfalfa weevil activity. Illinois generally experiences two larval peaks, one from fall-laid. Hypera postica Gyllenhal.

Alfalfa weevil is one of the two most-damaging insect pests of alfalfa in Pennsylvania (the other is potato leafhopper).

It is an exotic species that likely evolved in Asia, but appears to have been introduced to the United States at least three times. Alfalfa Weevil In Manitoba. The alfalfa weevil (Hypera postica) is one of the primary insects that can defoliate alfalfa. It can be an important early-season pest of established alfalfa stands.

New seedings are not typically affected. Alfalfa is the preferred host, but alfalfa weevil will also feed on other legumes, such as some species of clover. Alfalfa Weevils (Alfalfa and Egyptian Alfalfa) Alfalfa Weevil: Hypera postica Egyptian Alfalfa Weevil: Hypera brunneipennis (Reviewed 1/17, updated 1/17, corrected 12/18) especially the Egyptian alfalfa weevil.

Adult weevils of both species are dark gray and about inch. Alfalfa Weevil, Hypera postica Hosts: Alfalfa. Symptoms: Larvae do the most damage, although adult alfalfa weevils are also injurious. Early season feeding in leaf buds and terminal growing areas may seriously retard normal plant growth.

As the larvae grow, they feed on leaves, and eventually skeletonize them. The larvae can easily be seen. 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.

Life Cycle Some initial egg laying during November may take place before the onset of cold weather. To introduce genetic resistance against alfalfa weevil (Hypera postica), leaves and petiole explants of three commercial alfalfa genotypes, including Km, Kk and Syn were transformed with Agrobacterium tumefaciens strains GV, LBA and AGL All the Agrobacterium strains used harbored the recombinant binary vector pBI containing a synthetic cry3a gene under Cited by: Virginia is a natural laboratory for studying overwintering habits of the alfalfa weevi1.

At higher elevations, winters are relatively harsh and weevil pressure on the alfalfa crop is usually light. Much heavier pressure is the rule at lower elevations where winters are by: 4.

Alfalfa weevil, (Hypera postica), insect pest of the family Curculionidae (order Coleoptera) whose larvae damage crops, most often alfalfa and originally from Asia, the alfalfa weevil was introduced from Europe into the United States in the early 20th century and is.

alfalfa weevil Hypera postica (Gyllenhal, ) About This Subject; View Images Details; View Images; Hypera Subject: Hypera postica (Gyllenhal, ) Other System Links. ITIS: NPDN Pest: INASBWA. Synonyms and Other Names. Other Common Names: lucerne leaf weevil, clover leaf weevil.

Categories. Insects - Foliage Feeding Insects. Common Name: Alfalfa weevil Scientific Name: Varies Order: Coleoptera Description: Adult beetle is a brown weevil, about to inches long, with a downward projecting beak and a wide darker stripe down the middle of the back.

The color may vary from almost uniform brown to nearly black. Larvae are legless, plump-bodied and yellowish when young turning to pale green as they get larger. carbaryl (numerous products) at 1 to lb ai/a.

PHI 7 days for grazing or cutting. REI 12 hr. If pretreatment damage is extensive, cut alfalfa and treat the stubble for alfalfa weevil larvae. This product is not effective against adult alfalfa weevils.

Do not apply more than once per cutting. When SgD and HeG strain were treated with the rate of >20 infective juveniles (ijs) per alfalfa weevil larva, mortality was ca. % at the late instars of H. postica in 3 days. Alfalfa Weevil Hypera postica (Gyllenhal, ) (Coleoptera: Curculionidae) On three occasions, this destructive pest of alfalfa was accidentally introduced in North America.

Alfalfa weevil has been the target of classical biological control efforts since its discovery in North America more than 90 years ago.

Title: Manage The Alfalfa Created Date: 2/27/ AM. Alfalfa Weevil Economic Thresholds Economic thresholds have been developed to aid decision making on alfalfa weevil control.

Since we haven't had any reports of alfalfa weevil in Nebraska, and alfalfa first cutting is approaching, we present thresholds and recommendations for 50% bud and later in Table thresholds were derived by North Dakota State University entomologists (Beauzay et.

Mature weevil larvae are 5 to 6 mm long and light green, with a distinctive white band along the middle of the back. Figure 1. Alfalfa weevil adult (left) and larva (right) with feeding damage (photos by Patricia Monk). Once a field becomes infested with alfalfa weevil, some damage usually occurs every year.

ALFALFA WEEVIL Hypera postica (Gyllenhal) -- Coleoptera, Curculionidae (ContactsGO TO ALL: Bio-Control Cases First found in the United States near Salt Lake City, Utah inHypera postica is believed to have invaded from Europe (Titus).

The weevil was confined to 12 western states until when it was detected in Maryland (Bissell ). Comp Biochem Physiol. Aug;18(4) Succinate oxidase system in the alfalfa weevil, Hypera postica, during aestivation (summer diapause).Cited by: 3.

The Alfalfa Weevil in Utah Fact Sheet No. 58 January Edward W. Evans Extension Entomologist Introduction The alfalfa weevil is a major pest throughout Utah. It is a beetle with one generation per year.

Eggs hatch in the spring, and the grub-like immature weevils (larvae) feed by chewing on the alfalfa. The alfalfa weevil, Hypera postica (Gyllenhal, ), is a variable worldwide pest that heavily damages alfalfa fields and is widely distributed in Iran.

The lack of information about Iranian populations of has motivated us to examine immature life stages H. posticaCited by: 1. 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 layeggs in a lifetime and insert at a time into alfalfa.

FEATURE ARTICLE. Alfalfa Weevil in the Midwest: A Successful Case of Classical Biological Control. The alfalfa weevil, Hypera postica, is an example of a highly successful case of the "classical" approach to biological control in the alfalfa weevil is known as a serious pest of alfalfa in the Midwest and throughout the U.S.

The weevil damages alfalfa by chewing and skeletonizing. ALFALFA WEEVIL Hypera postica Gyllenhal Alfalfa weevil is one of the two most-damaging insect pests of alfalfa in Pennsylvania (the other is potato leafhopper). It is an exotic species that likely evolved in Asia, but appears to have been introduced to the United States at least three times.

As.species to feeding by adult alfalfa weevils (Hypera postica). Environ. Entomol. Resistance of glandular-haired Medicago species to oviposition by alfalfa weevils (Hypera postica). Environ.

Entomol. Ratcliffe, R.H. Standard tests to characterize pest resistance in alfalfa cultivars. USDA Misc. Pub.p. CLASSICAL BIOLOGICAL CONTROL OF THE ALFALFA WEEVIL IN JAPAN Masami TAKAGI1, Masami OKUMURA2, ing agent for classical biological control of alfalfa weevil in Japan, Thus, a redistribution pro- Life cycle of the alfalfa weevil, Hypera postica and its parasitoid, Bathyplectes anurus in a Japanese.

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