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Dive into the research topics where George G. Gyrisco is active.

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Featured researches published by George G. Gyrisco.


Ecology | 1960

The relationship between several environmental factors and the density of European chafer larvae in permanent pasture sod.

H. H. Shorey; R. H. Burrage; George G. Gyrisco

The European chafer, Amphimallon niajalis (Razoumnowsky) (Scarabaeidae) is an introduced pest of turf which has become established in several areas in New York, Connecticut, and West Virginia. The largest of these infested areas include major portions of Wayne, Ontario, and Monroe Counties, New York. The larvae of the European chafer feed primarily on fibrous root systems and often cause considerable damage to stands of grasses and winter grains. The adults, which are active (luring June and July, do not feed. They emerge from the soil at sunset, fly to trees, mate, and return to the soil before sunrise. With the exception of these adult nocturnal flights, the entire life cycle is completed in the soil. In New York, one year is normally required for development from egg to adult. There are 3 larval instars, with the 3rd instar larva being the usual overwintering stage. Burrage and Gyrisco (1954a, 1954b) have demonstrated that the larvae of the European chafer are not distributed at random in permanent l)asture sod. The (listribution of the larvae more closely approximated a negative binomial than a Poisson series, indicating that there is more clustering of larvae in the soil than would be expected if they were distributed at random. Some of this clustering probably arises because, although deposited singly, the eggs are laid in small groups in the soil. Clustering also could be attril)utal)le to environmental factors which might produce differences in the suitability or accessibility to the European chafer of different areas within a field. Certain of these factors have been investigated by Gyrisco et al. (1954), who found that areas in fields kept fallow or covered by tall grass contained fewer larvae than areas having a short grass cover. They noted also that larval infestations were usually light in poorly drained locations. In the course of sampling studies conducted between 1949 and 1958, several environmental


Entomologia Experimentalis Et Applicata | 1959

A STUDY OF THE FLIGHTS HABITS OF THE EUROPEAN CHAFER

William G. Evans; George G. Gyrisco

By using a large cage in the field and a system of marking, the flight activities of 36 females and 49 males of the European chafer were followed during June and July, 1954.


Annals of The Entomological Society of America | 1966

Relation of the Feeding Process of the Pea Aphid to the Inoculation of Pea Enation Mosaic Virus

Lowell R. Nault; George G. Gyrisco


Annals of The Entomological Society of America | 1960

Effect of Temperature on the Rate of Development of Lygus Lineolaris (Hemiptera: Miridae)

R. L. Ridgway; George G. Gyrisco


Journal of Economic Entomology | 1954

Distribution of Third Instar Larvae of the European Chafer and the Efficiency of Various Sampling Units for Estimating Their Populations

R. H. Burrage; George G. Gyrisco


Journal of Economic Entomology | 1963

The Spatial Pattern of the Pea Aphid in Alfalfa Fields

H. Y. Forsythe; George G. Gyrisco


Annals of The Entomological Society of America | 1967

Migration of the Alfalfa Weevil, Hypera postica (Coleoptera: Curculionidae), to and from Estivation Sites

Ronald J. Prokopy; Edward J. Armbrust; Warren R. Cothran; George G. Gyrisco


Journal of Economic Entomology | 1954

Estimates of Populations and Sampling Variance of European Chafer Larvae from Samples Taken during the First, Second and Third Instar

R. H. Burrage; George G. Gyrisco


Journal of Economic Entomology | 1952

Persistence of Insecticide Residues on Forage Crops

Lemac Hopkins; L. B. Norton; George G. Gyrisco


Journal of Economic Entomology | 1964

Residues of Heptachlor Epoxide and Telodrin in Milk from Cows Fed at Part per Billion Insecticide LeveIs

D. D. Hardee; Walter H. Gutenmann; G. I. Keenan; George G. Gyrisco; Donald J. Lisk; F. H. Fox; G. W. Trimberger; R. F. Holland

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