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    PARASITISM OF LYGUS SPP. EGGS BY THE MYMARID WASP ANAPHES OVIJENTATUS (CROSBY AND LEONARD).

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    Author
    JACKSON, CHARLES GLENWOOD.
    Issue Date
    1982
    Keywords
    Anaphes ovijentatus.
    Lygus.
    Host-parasite relationships.
    Insect pests -- Control -- Biological control.
    
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    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    Various biological relationships between the myramid egg parasite, Anaphes ovijentatus (Crosby and Leonard), and its hosts were studied. Eggs of the four major species of Lygus that occur on crops were highly parasitized. Other mirid hosts in southern Arizona were collected from weeds in agricultural areas. Small numbers of Nabis alternatus Parshley and N. americoferus Carayon, predators of several insect pests, were parasitized in the laboratory. The membracid Spissistilus festinus (Say) was an infrequent host. Parasitism of L. hesperus was similar (82-88%) for eggs 1-6 days old at 25°C, but parasitism of 7-day-old eggs was significantly reduced (18.9%). Parasitism must occur at least 24 hours prior to host egg hatch to be successful; the period of time required for A. ovijentatus egg development. Anaphes ovijentatus developed from egg to adult in L. hesperus eggs at a constant temperature of 12.8°C and at variable regimes with means of 12.8, 10.6, and 32.8°C. An average of 26 progeny per female were produced at the variable 12.8 and 10.6°C regimes, only a few progeny were produced at a constant 12.8°C and none were produced at the variable 32.8°C regime. Lygus hesperus eggs hatched at all four temperature regimes, but nymphs survived to adulthood only at the variable regimes of 12.8 and 10.6°C. Total egg to egg periods at the variable 12.8°C was approximately 103 days for L. hesperus and about 54 days for A. ovijentatus. The majority of the L. hesperus eggs were deposited in the upper halves of cotton, alfalfa, and the crucifer Sisymbrium irio L. plants. L. hesperus deposited more eggs in alfalfa than in cotton plants, but showed no preference between alfalfa and S. irio. Anaphes ovijentatus did not demonstrate clear preferences for L. hesperus eggs in any plant species or plant section.
    Type
    text
    Dissertation-Reproduction (electronic)
    Degree Name
    Ph.D.
    Degree Level
    doctoral
    Degree Program
    Entomology
    Graduate College
    Degree Grantor
    University of Arizona
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