Reduction in feeding by diapausing and postdiapause pear psylla (Homoptera: Psyllidae) caused by extract from buffalo gourd (Cucurbitaceae)
Abstract
Rates of honeydew production were lower in diapausing winterform pear psylla, Cacopsylla pyricola (Foerster), than in psylla brought out of diapause by exposure either to long-day conditions or to an insect growth regulator (fenoxycarb). An extract obtained from a nonhost species, buffalo gourd (Cucurbita foetidissima HBK.), caused reduced honeydew production when misted onto pear shoots. Reductions in feeding were as pronounced in diapausing insects as in psylla that were in a postdiapause condition. Ovarian development scores were positively correlated with honeydew production, indicating that feeding deterrents may be useful for delaying the onset of egglaying in the field.
Key words: Insecta; Cacopsylla pyricola; diapause; honeydew production; feeding deterrent
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