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- W2331959547 abstract "Pear psylla, Psylla pyricola Foerster, nymph density was related to honeydew russet on fruit of ‘Bartlett’ and ‘Anjou’ varieties. Regression analyses were performed for both peak nymph density and accumulated nymph feeding days as independent variables and damage index as the dependent variable. Damage index was based on U.S. grade standards for fresh market pears and was the sum of percent U.S. 2 grade plus two times the percent culls. These regressions projected that a peak nymph density of 0.3 nymph per leaf on both varieties produced detectable fruit damage. Eighteen and nine nymph feeding days per leaf would produce fruit injury on ‘Bartlett’ and ‘Anjou,’ respectively. Factors affecting these parameters and implications to pear pest management are discussed." @default.
- W2331959547 created "2016-06-24" @default.
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- W2331959547 date "1988-04-01" @default.
- W2331959547 modified "2023-10-07" @default.
- W2331959547 title "Damage Threshold for Pear Psylla Nymphs (Homoptera: Psyllidae)" @default.
- W2331959547 doi "https://doi.org/10.1093/jee/81.2.599" @default.
- W2331959547 hasPublicationYear "1988" @default.
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