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Fruit Crops: Pears

Chapter

Abstract

Mealybugs are injurious to pears in Korea, Tasmania, New York, Australia, New Zealand, Chile, China, Washington, Yakima etc. Pseudococcus longispinus (Tar-Toz.) and Pseudococcus viburni (Ps.obscurus Essig.) have been reported in commercial pear orchards of South Africa. The comstock mealybug Pseudococcus comstocki (Kuwana) poses two major concerns for pear processing industry of New York. Fruits to be made into puree typically are not peeled or cored by the processors, so infestations can result in unacceptable contamination of the product. Another problem of concern to pear growers is that honeydew secreted by crawlers is a substrate to sooty molds growing on the fruit surface. In Japan, Ps. comstocki has become the pest most regularly occurring in pear orchards because of the destruction of its natural enemies by the frequent application of organochlorine and organophosphorus insecticides. Pseudococcus viburni appeared to predominate under intensive spray regimes, whereas the proportions of Ps. longispinus increased under light or no-spray programmes. Pseudaphycus malinus Gah., a good host searching parasitoid, was released during the second and third nymphal instars of the pest in the spring. Two thousand adult parasites emerged/sheet, and two sheets were usually required for each moderately infested pear tree.

Keywords

Natural Enemy Frequent Application Stone Fruit Fruit Surface Adult Parasite 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer India 2016

Authors and Affiliations

  1. 1.Indian Institute of Horticultural ResearchBangaloreIndia

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