Abstract
Experiments were conducted to evaluate the preferring location of the citrus rust mite, Phyllocoptruta oleivora inhabiting citrus trees on different heights level, high, medium and low and four sides of the citrus tree locations east, north, west and south. One orange cultivated area Balady variety was chosen for the experimental study at Enshas region located in Sharkia Governorate (latitude 52°38'11.7N and longitude 5°49'37.66E). The lower, medium and high trees levels were selected at 80cm, 80-150cm., and more than 150 cm. from the ground level, respectively. The study was conducted during two successive years starting from January 2017 till end of December 2018.The results showed that P. oleivora preferred the warmth and high relatively humid conditions, allocated at tree surfaces near the soil on contrast the plant surfaces far of soil. That is where the steaming rate of irrigation water provides the predator with the optimal high humidity for population increase. In addition, the study indicates that the citrus rust mite prefers living the east side of the tree was exposed to sunlight more than the other sides
Highlights
Citrus fruits export in the world was total economic valued by US$ 6,935 million (Faostat, 2008)
Population dynamics of P. oleivora (Ashmead) on four citrus tree sides of the citrus tree during two years 2017 and 2018 on fruits and leaves of Balady orange at Sharkia Governorate is presented in figure 1
One peak was in August with 12769, 6256, 5517and 2661P. oleivora individuals /10 fruits and 100 leaves at east, west, north, and south sides of the citrus trees, respectively.The population of the citrus rust mite, P. oleivora appeared with low density during the winter season and slightly increased in spring season, sharply increased on summer season and returned decreased on autumn season at the four sides of the citrus tree
Summary
Citrus fruits export in the world was total economic valued by US$ 6,935 million (Faostat, 2008). Egypt's orange exports increased to reach 6.803 thousand tons during 2011 with a total economic value of 433 million dollars, which represented 6% of world tradeeconomic volume. The citrus rust mite attacks all citrus varieties, preferring lemons and limes. Damage on these fruits appears as silvery patches, whereas on oranges and grapefruits it is rust-like. The citrus rust mite female produces about 20-30 eggs, which are laid into pits and depressions, preferentially on the fruits and on leaves or in small cracks in the bark of twigs. All developmental stages can be found throughout the year; only reproduction is temporarily suspended during periods with low temperatures
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