Susceptibility of Certain Citrus Varieties to Infestation with the False Spider Mite, Brevipalpus obovatus (Donnadieu)

Document Type : Original research articles

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Plant Protection Research Institute, ARC, Dokki, Giza, Egypt.

Abstract

The three tested citrus varieties marked variation in their susceptibility to Brevipalpus obovatus infestation. Susceptibility indices calculated for each variety showed that the mean number of mite populations of the three tested citrus varieties recorded few individual during the first period of observation; while later reduction in mite population was recorded on all varieties from December to April during the two successive seasons, 2013-2014 and 2014-2015. Thereafter, a significant higher mite populations was recorded reached a peak during August for the three citrus varieties with a total number of 261 and 298.33 mites/sq. inch on common Balady orange, 219.67 and 259 mites/sq. inch on Washington navel orange and 185 & 239 mites/sq. inch on common Mandarin orange during 2013-2014 and 2014-2015 seasons, respectively. Accordingly, common Balady orange variety was the most susceptible for mite infestation with an average number of 83.16 and 89.02 mites/sq. inch; while, least infested variety was common Mandarin orange with rates 42 and 59.5 adults/25 leaves, during the two studied seasons, respectively.

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