Author: Jack D. Eves
Publisher:
ISBN:
Category : Alfalfa
Languages : en
Pages : 12
Book Description
Population Dynamics of Larvae of Alfalfa Leafcutting Bee, Megachile Rotundata, in Eastern Washington
Population Dynamics of Larvae of Alfalfa Leafcutting Bee, Megachile Rotundata, in Eastern Washington
Author: Jack D. Eves
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 30
Book Description
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 30
Book Description
Technical Bulletin
Author:
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 32
Book Description
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 32
Book Description
The Influence of Seeding Rates on Yield and Stand of Alfalfa in Oregon's Willamette Valley
Author: Earl M. Bates
Publisher:
ISBN:
Category : Alfalfa
Languages : en
Pages : 592
Book Description
Publisher:
ISBN:
Category : Alfalfa
Languages : en
Pages : 592
Book Description
Parasites, Predators and Nest Destroyers of the Alfalfa Leafcutting Bee, Megachile Rotundata
Author: Jack D. Eves
Publisher:
ISBN:
Category : Alfalfa leafcutting bee
Languages : en
Pages : 20
Book Description
Publisher:
ISBN:
Category : Alfalfa leafcutting bee
Languages : en
Pages : 20
Book Description
Etiology and Pathogenesis of Chalkbrood in the Alfalfa Leafcutting Bee, Megachile Rotundata
Author: John Donald Vandenberg
Publisher:
ISBN:
Category : Bees
Languages : en
Pages : 150
Book Description
Chalkbrood is a mycosis of larvae of the alfalfa leafcutting bee, Megachile rotundata (Fabricius). It is a serious threat to alfalfa seed growers in western North America who use populations of this bee for pollination. Basic studies were conducted to determine the etiology of this disease and the course of pathogenesis in afflicted larvae. Spores of Ascosphaera aggregata Skou were found to cause chalkbrood in one- to nine-day-old larvae of M. rotundata. A distinctive syndrome accompanied infection of older larvae. The host hemolymph became cloudy with fungal mycelium at the time of death. A change from normal cream color to pink or tan occurred in larvae soon thereafter. Sporulation beneath the host cuticle took place within 2 weeks after death. Younger larvae did not undergo a color change but remained cream colored and the fungus did not sporulate. Ascosphaera aggregata spores germinated in the midgut and penetrated the hemocoel of fourth instar larvae within 2 days after inoculation. Invasion of epidermis, tracheae and muscles followed within 3 more days. The entire hemocoel was nearly filled with mycelium at the time of death, 3 - 7 days after inoculation. Conditions of reduced redox potential existed in the midguts of fourth instar larvae. A. aggregata spores germinated in vitro under conditions of reduced potential but mycelium proliferated under the oxidized conditions of an open petri dish. Events in vivo reflected preferences shown in vitro: germination occurred in the reduced midgut and mycelium proliferation occurred in the more oxidized tissues of the hemocoel. Other Ascosphaera species were able to infect M. rotundata larvae. Spores of both A. apis (Maassen ex Claussen) Olive and Spiltoir and A. proliperda Skou caused a syndrome distinct from that caused by A. aggregata. No color changes were evident following infection by A. apis or A. proliperda. White mycelia erupted through the cuticle within 2 days after death. Sporulation outside the host cuticle followed within 1-2 weeks. The time to death was significantly shorter for larvae infected with A. proliperda than for those infected with A. apis. Spores taken from cadavers grew less readily on the pollen bee diet and appeared to be more virulent than spores produced in vitro. Ascosphaera atra Skou and Hackett and A. major (Prokschl and Zobl) Skou did not infect larvae but grew saprophytically on the pollen diet.
Publisher:
ISBN:
Category : Bees
Languages : en
Pages : 150
Book Description
Chalkbrood is a mycosis of larvae of the alfalfa leafcutting bee, Megachile rotundata (Fabricius). It is a serious threat to alfalfa seed growers in western North America who use populations of this bee for pollination. Basic studies were conducted to determine the etiology of this disease and the course of pathogenesis in afflicted larvae. Spores of Ascosphaera aggregata Skou were found to cause chalkbrood in one- to nine-day-old larvae of M. rotundata. A distinctive syndrome accompanied infection of older larvae. The host hemolymph became cloudy with fungal mycelium at the time of death. A change from normal cream color to pink or tan occurred in larvae soon thereafter. Sporulation beneath the host cuticle took place within 2 weeks after death. Younger larvae did not undergo a color change but remained cream colored and the fungus did not sporulate. Ascosphaera aggregata spores germinated in the midgut and penetrated the hemocoel of fourth instar larvae within 2 days after inoculation. Invasion of epidermis, tracheae and muscles followed within 3 more days. The entire hemocoel was nearly filled with mycelium at the time of death, 3 - 7 days after inoculation. Conditions of reduced redox potential existed in the midguts of fourth instar larvae. A. aggregata spores germinated in vitro under conditions of reduced potential but mycelium proliferated under the oxidized conditions of an open petri dish. Events in vivo reflected preferences shown in vitro: germination occurred in the reduced midgut and mycelium proliferation occurred in the more oxidized tissues of the hemocoel. Other Ascosphaera species were able to infect M. rotundata larvae. Spores of both A. apis (Maassen ex Claussen) Olive and Spiltoir and A. proliperda Skou caused a syndrome distinct from that caused by A. aggregata. No color changes were evident following infection by A. apis or A. proliperda. White mycelia erupted through the cuticle within 2 days after death. Sporulation outside the host cuticle followed within 1-2 weeks. The time to death was significantly shorter for larvae infected with A. proliperda than for those infected with A. apis. Spores taken from cadavers grew less readily on the pollen bee diet and appeared to be more virulent than spores produced in vitro. Ascosphaera atra Skou and Hackett and A. major (Prokschl and Zobl) Skou did not infect larvae but grew saprophytically on the pollen diet.
Station Bulletin
Author: Oregon. Agricultural experiment station, Corvallis
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 634
Book Description
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 634
Book Description
Apicultural Abstracts
Author:
Publisher:
ISBN:
Category : Bees
Languages : en
Pages : 598
Book Description
Publisher:
ISBN:
Category : Bees
Languages : en
Pages : 598
Book Description
The Effect of Pesticides on the Alfalfa Leafcutting Bee, Megachile Rotundata
Author: Carl A. Johansen
Publisher:
ISBN:
Category : Alfalfa
Languages : en
Pages : 12
Book Description
Publisher:
ISBN:
Category : Alfalfa
Languages : en
Pages : 12
Book Description
Effects of Exogenous Changes in Prices and Final Demand for Wheat and Energy Resources on the Washington Economy
Author: Andrew Desmond O'Rourke
Publisher:
ISBN:
Category : Alfalfa
Languages : en
Pages : 354
Book Description
Publisher:
ISBN:
Category : Alfalfa
Languages : en
Pages : 354
Book Description