Title: Postdiapause Development and Mating Status of Pear Psylla (Homoptera: Psyllidae) Affected by Pear and Nonhost Species
Abstract:Large numbers of winterform pear psylla, Cacopsylla pyricola Foerster, leave the pear orchard in the fall, overwinter in diapause in nonpear habitats, and return to pear orchards the following spring....Large numbers of winterform pear psylla, Cacopsylla pyricola Foerster, leave the pear orchard in the fall, overwinter in diapause in nonpear habitats, and return to pear orchards the following spring. Postdiapause development of overwintering forms, including oogenesis and mating (indicated by spermatophore numbers in females), was more advanced in early spring for insects collected from pear than for those collected from apple, a nonhost but an important species for overwintering. These results were confirmed by caging psylla on pear and apple in the field and laboratory. Psylla were also caged on a number of ornamental species in fall, and mortality and postdiapause development were monitored. Some insects, with the exception of those placed on a dead pear tree, survived the winter on all plant species. Postdiapause development on most species lagged behind that on pear. Psylla collected from pear trees on the orchard perimeter were often less advanced than those collected from the orchard interior, suggesting that psylla tended to colonize orchard edges. These effects were most pronounced in orchards and during years in which reentry rates were highest. Ovarian development of psylla was similar in insects removed from yellow sticky traps and from clear sticky traps. Females removed from yellow traps had more spermatophores than those removed from clear traps on two sampling dates.Read More
Publication Year: 1994
Publication Date: 1994-03-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 16
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