Abstract
For several years the palm dust mite, Oligonychus afrasiaticus (McGregor) has been an economically important pest of date palm. Biology and life table parameters of the date dust mite, O. afrasiaticus were studied on fronds of three date palm cultivars: Bartamoda (dry), Sewi (semi dry) and Zaghlol (soft) at laboratory conditions of 30 and 35°C & 60 ±5% R.H. and 16L. The results revealed that, the longest and shortest oviposition period and total longevity of O. afrasiaticus females were recorded at 30°C (22.5 & 26.90 days) on Sewi and 35°C (6.9 & 10.0 days) on Zaghlol variety, respectively. The fecundity increased as temperature decreased from 30.5, 37.45 and 25.5 eggs at 30°C to 27.8, 29.15 and 15.94 eggs at 35°C on Bartamoda, Sewi and Zaghlol varieties, respectively. The lowest and highest values of the intrinsic rate of increase (rm) were 0.107 and 0.229 individuals/female/day that obtained at 30 and 35°C on Zaghlol and Sewi varieties, respectively. The mean generation time (T) significantly decreased from 23.6, 22.4 and 22.76 days to 13.08, 11.90 and 12.26 days with increasing temperature from 30°C to 35°C, on Bartamoda, Sewi and Zaghlol varieties, respectively. The results of this study indicate that O. afrasiaticus could increase rapidly when Sewi and Bartamoda fronds serve as a food source more than Zaghlol date palm variety.
Highlights
Date palm is one of the most crucial treasures inside the Arab republic of Egypt, which have been well-known for their dietary price within the oases and many agricultural regions of Egypt during the ages
The results of this study indicate that
Date palm trees were observed to be badly affected by different injurious mites
Summary
Date palm is one of the most crucial treasures inside the Arab republic of Egypt, which have been well-known for their dietary price within the oases and many agricultural regions of Egypt during the ages. Egypt is ranked within the first place some of the date-generating international locations in the international market. Regardless of Egypt's excessive rank in phrases of date production that amounts to greater than 1.7 million tons, nearly 21% of the sector production estimated at 8 million lots, its export contribution to the worldwide dates marketplace is low. Date palm trees were observed to be badly affected by different injurious mites. This causes large damage and lead to economic losses (Taha et al, 2019). In Iraq, O. afrasiaticus caused within 50–80% produce loss of dates within years on dry, dusty and stormy weather (Al-Jboory and Al-Suaide, 2010). The date palm dust mite, O. afrasiaticus has become an important pest of immature date palm fruits on Sewi variety at the New Valley Governorate
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