Abstract
This work was conducted to investigate the population dynamics of citrus brown mite, E. orientalis (Klein) on Navel orange, Grapefruit, and Lemon varieties at El-Sharqia Governorate during two successive years, from March 2017 to February, 2019. The obtained results showed that the population dynamics of citrus brown mite, E. orientalis has been varied based on host plant verity. Meanwhile, it has one annual peak in August on Navel orange with total numbers (931 & 884 individual) and on Lemon (305 & 324 individual) at average temperature (31.58 & 31. 9 C°) and relative humidity (56 & 59 %) in the first and second years, respectively. While the highest population number of the citrus brown mite species on Grapefruit was recorded (844 & 833 individual) in September at average temperature (29.77 & 30.37 C°) and relative humidity (57 & 60.4 %) respectively. On the other hand, the population of predacious mites, Euseius scutalis (Athias-Henriot) and Amblyseius (Typhlodromips) swirskii Athias was recorded on the three citrus verities: Navel orange, Grapefruit, and Lemon, one annual peak in November during the first year when the highest number of predators were (246, 248 and 111 individual, respectively) at average temperature 23.77 C° and relative humidity 63 %. While in the second year the number of predators was (276, 341, and 210 individuals, respectively) at average temperature 24.40C° and relative humidity 63.5%.
Highlights
Citrus is the foremost fruit crops all over the world in terms of planting area and production
Data in tables (1 and 2) showed that the population of E. orientalis have been affected by citrus variety and weather factors as follow: a- On Navel Orange: The population of citrus brown mite, E. orientalis was significantly positively correlated with average temperature and nonsignificant negatively correlated with relative humidity; it has one annual peak on each leaf and fruits during the studying period
The population of citrus brown mite, E. orientalis was started with few numbers on navel orange in March and progressively increased until it reached the highest numbers on leaves and fruits in the first year
Summary
Citrus is the foremost fruit crops all over the world in terms of planting area and production. Egypt is the sixth-largest producer of citrus crops, and considered the largest exporter of orange in the world (FAO,2016). The phytophagous mites are the most important obstacles to citrus production in Egypt The great diversity of these tiny plant feeders is related to their intimate host relationships (Oldfield, 1996), while, their impact as specialized phytophagous mites is well known and strongly accented in each of their involvements as direct plant pests, plant-pathogen vectors, and food sources for predators (Walter et al, 1995; and Zhang 2003).
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