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Insects

Title:		Stability of Cacopsylla pyricola (Hemiptera: Psyllidae) Populations in Pacific Northwest Pear Orchards Managed with Long-Term Mating Disruption for Cydia pomonella (Lepidoptera: Tortricidae)
Author(s):		Amarasekare KG; Shearer PW;
Address:		"Department of Agricultural and Environmental Sciences, College of Agriculture, Tennessee State University, 3500 John A. Merritt Blvd., Nashville, TN 37209, USA. kaushalya2641@yahoo.com. Tree Fruit Research and Extension Center, Washington State University, 1100 N. Western Ave., Wenatchee, WA 98801, USA. peter.shearer@wsu.edu"
Journal Title:		Insects
Year:		2017
Volume:		20170930
Issue:		4
Page Number:		-
DOI:		10.3390/insects8040105
ISSN/ISBN:		2075-4450 (Print) 2075-4450 (Electronic) 2075-4450 (Linking)
Abstract:		"This study focused on conservation biological control of pear psylla, Cacopsylla pyricola, in the Pacific Northwest, USA. We hypothesized that insecticides applied against the primary insect pest, codling moth Cydia pomonella, negatively impact natural enemies of pear psylla, thus causing outbreaks of this secondary pest. Hence, the objective of this study was to understand how codling moth management influences the abundance of pear psylla and its natural enemy complex in pear orchards managed under long-term codling moth mating disruption programs. We conducted this study within a pear orchard that had previously been under seasonal mating disruption for codling moth for eight years. We replicated two treatments, 'natural enemy disrupt' (application of two combination sprays of spinetoram plus chlorantraniliprole timed against first-generation codling moth) and 'natural enemy non-disrupt' four times in the orchard. Field sampling of psylla and natural enemies (i.e., lacewings, coccinellids, spiders, Campylomma verbasci, syrphid flies, earwigs) revealed that pear psylla populations remained well below treatment thresholds all season despite the reduced abundance of key pear psylla natural enemies in the natural enemy disrupt plots compared with the non-disrupt treatment. We speculate that pear psylla are difficult to disrupt when pear orchards are under long-term codling moth disruption"
Keywords:		biological control codling moth mating disruption natural enemies pear pest insects pear psylla;
Notes:		"PubMed-not-MEDLINEAmarasekare, Kaushalya G Shearer, Peter W eng Switzerland 2017/10/05 Insects. 2017 Sep 30; 8(4):105. doi: 10.3390/insects8040105"