Analysis of Pear Psylla (Homoptera: Psyllidae) Populations and Associated Damage in a Pennsylvania Pear Orchard

1984 ◽  
Vol 13 (1) ◽  
pp. 278-281 ◽  
Author(s):  
C. E. Savinelli ◽  
R. C. Tetrault
Keyword(s):  
Pear Psylla ◽  
Pear Orchard

THE INFLUENCE OF THREE INSECTICIDES ON PREDATION OF THE PEAR PSYLLA, PSYLLA PYRICOLA

1967 ◽  
Vol 99 (12) ◽  
pp. 1292-1297 ◽  
Author(s):  
R. D. McMullen ◽  
C. Jong
Keyword(s):  
Predation Pressure ◽  
Population Densities ◽  
Predator Species ◽  
Chrysopa Carnea ◽  
Azinphos Methyl ◽  
Pear Psylla ◽  
Pear Orchard ◽  
Insect Predators ◽  
Campylomma Verbasci ◽  
Competition For Food

AbstractThe effects of sprays of DDT, azinphos-methyl, and Ryania applied to a pear orchard on population densities of insect predators of Psylla pyricola Förster were assessed. The P. pyricola in the orchard were naturally tolerant to DDT and Ryania and highly resistant to azinphos-methyl. DDT eliminated or severely reduced numbers of Deraeocoris brevis piceatus Knight, D. fasciolus Knight, Diaphnocoris provancheri (Burque), and Campylomma verbasci (Meyer). Chrysopa carnea Stephens and C. oculata Say were moderately reduced. Anthocoris antevolens (White) and A. melanocerus Reuter were highly tolerant to DDT. Azinphos-methyl severely reduced numbers of A. antevolens, A. melanocerus, C. verbasci, and D. provancheri. C. carnea and C. oculata were moderately reduced. D. brevis piceatus and D. fasciolus were tolerant to azinphos-methyl. Ryania severely reduced numbers of A. antevolens, A. melanocerus, and C. verbasci; moderately reduced D. provancheri; and did not affect D. brevis piceatus, D. fasciolus, C. carnea, or C. oculata.In the DDT-treated plots the relative densities of Anthocoris spp. approximately doubled compared with the untreated plots. This was probably due to removal of competition for food by other predator species. Large increases ill the relative densities of Deraeocoris spp. were also observed in the Ryania treatments, probably for similar reasons. Significant increases in the P. pyricola populations in response to removal of predation pressure by the insecticide treatments occurred in the DDT and azinphos-methyl plots bur not in the Ryania plots.

EFFECT OF INSECTICIDES ON PREDATORS OF THE PEAR PSYLLA, PSYLLA PYRICOLA (HEMIPTERA: PSYLLIDAE), IN ONTARIO

1983 ◽  
Vol 115 (10) ◽  
pp. 1409-1414 ◽  
Author(s):  
Elmer A. C. Hagley ◽  
C. M. Simpson
Keyword(s):  
Predatory Mite ◽  
Pear Psylla ◽  
Anthocoris Nemoralis ◽  
Pear Orchard

AbstractThe predominant predator of the pear psylla, Psylla pyricola Foerster, in a pear orchard on the Niagara Peninsula, Ontario was the anthocorid, Anthocoris nemoralis (F.). Applications of permethrin (62.5 g a.i./ha) reduced numbers of the predator when applied at petal fall. Azinphosmethyl (336.4 g a.i./ha) applied at petal and at 1st cover did not affect A. nemoralis. Both insecticides reduced the numbers of the predatory mite, Balaustium putmani Smiley. Species of Hemiptera other than A. nemoralis, especially Miridae and Reduviidae, were reduced by permethrin applied at petal fall and by azinphosmethyl applied at 1st cover.

Climbing Night-shade as a Host of the Pear Psylla (Homoptera: Psyllidae)

1966 ◽  
Vol 98 (5) ◽  
pp. 558-559 ◽  
Author(s):  
Walter H. A. Wilde
Keyword(s):  
Life Cycle ◽  
Cover Crop ◽  
Growing Season ◽  
Instar Nymph ◽  
Plant Host ◽  
Solanum Dulcamara ◽  
Pear Psylla ◽  
The World ◽  
Pear Orchard ◽  
Hard Shell

In Ontario, pear has been the only recorded host of the pear psylla, Psylla pyricola Foerster (Goble 1963), although in other areas of the world Quince, Downy Chess Grass, and apple twigs have also been reported (Smith 1941; Swirski 1954; and Wilde 1963).Numbers of pear psylla adults were observed on climbing night-shade, Solanum dulcamara L. (Muenscher 1955) growing as cover crop in a pear orchard near Paris, Ontario, in 1965. Regular observation of psylla occurrence on this plant host throughout the growing season indicated that P. pyricola Foer. could complete its life cycle on S. dulcamara; eggs and nymphal stages up to the hard-shell stage, as well as cast nymphal skins, were observed on this host. Egg mortality was noted on those portions of S. dulcamara that were damaged showed severe wilting characteristics. Egg and second-instar nymph on the undersurface of the leaf of S. dulcamara are illustrated in Figs. 1 and 2.

scholarly journals PRE-BLOOM CONTROL OF PEAR PSYLLA, 2001

2002 ◽  
Vol 27 (1) ◽  
Author(s):  
J. E. Dunley ◽  
B. M. Greenfield ◽  
L. H. Bennett
Keyword(s):  
Pear Psylla ◽  
Bloom Control

Selection for monocrotophos resistance in pear psylla,Cacopsylla pyri(L.) (Hom., Psyllidae)

1995 ◽  
Vol 119 (1-5) ◽  
pp. 507-510 ◽  
Author(s):  
S. Berrada ◽  
T. X. Nguyen ◽  
D. Merzoug ◽  
D. Fournier
Keyword(s):  
Cacopsylla Pyri ◽  
Pear Psylla ◽  
Selection For

scholarly journals CONTROL OF PEAR PSYLLA WITH ABAMECTIN USING A CONVENTIONAL AIRBLAST SPRAYER AND A LOW VOLUME ‘PROPTEC’ SPRAYER, 2000

2001 ◽  
Vol 26 (1) ◽  
Author(s):  
J. E. Dunley ◽  
B. M. Greenfield ◽  
G. T. Hannig ◽  
L. H. Bennett
Keyword(s):  
Pear Psylla ◽  
Low Volume

PYRETHROID RESISTANCE IN PEAR PSYLLA, PSYLLA PYRICOLA FOERSTER (HOMOPTERA: PSYLLIDAE), AND SYNERGISM OF PYRETHROIDS WITH PIPERONYL BUTOXIDE

1989 ◽  
Vol 121 (3) ◽  
pp. 219-223 ◽  
Author(s):  
Everett C. Burts ◽  
Hugo E. van de Baan ◽  
Brian A. Croft
Keyword(s):  
Oxidase Activity ◽  
Pyrethroid Resistance ◽  
Cyano Group ◽  
Piperonyl Butoxide ◽  
Mixed Function Oxidase ◽  
Pear Psylla ◽  
Mixed Function Oxidase Activity

AbstractAdult pear psylla, Psylla pyricola Foerster, from commercial pear orchards near Wenatchee, WA, were tested using a slide-dip technique for susceptibility to fenvalerate over a 5-year period from 1984 to 1988. Results were compared with those from similar tests using psyllids from an unexposed population near Corvallis, OR. During 5 years, resistance of adults to fenvalerate increased by 16- to 32-fold at Wenatchee while that of the Corvallis population did not change. In 1988, tests with five pyrethroids and pyrethroid – piperonyl butoxide combinations indicated that pear psylla adults also were resistant to permethrin and flucythrinate but not to fenpropathrin or cyfluthrin which contain a cyano group that reduces their susceptibility to oxidase metabolism. Piperonyl butoxide synergism was proportional to the level of resistance, indicating that resistance is probably due to increased mixed function oxidase activity. Implications of this study to control of post-diapause winter form adults in commercial pear orchards is discussed.

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