Occurrence of dust mite, oligonychus afrasiaticus meg. On fruits, leaflets of some date palm trees and evaluation the efficiency of botanical compound, (biaco)‎ as compared with some acaricides

Abstract EN

This work was carried out in El-Karg region at Riyadh Governorate, which is representating the whole region, because of the similarity of the terrain, growing conditions and the passage of planting material throughout the years, on fruits& leaflets of some date palm during season 2007.

Occurrence of dust mite, Oligonychus afrasiaticus Meg.

On date (fruits and leaflets) and evaluation the efficiency of the potential compound "Biaco" as compared with some acaroids searching for other safer compound for controlling this mite species were studied, during season 2007.

1-Data showed that the active period of Oligonychus afrasiaticus mite occurred throughout the period from the first half of March until second half of October 2007.

Number of mites / 100 date fruits reached its maximum with 9095.5 mites / 100 dates on the 26th of July, then population was gradually decreased till the middle of October 124 mite 100 date fruits.

2-The mean percentages of infestation began after the 2nd week of March and reached 3%, while it was in its maximum on the 3rd week of October (80%).

3-Statistical analysis of the data revealed significant differences between botanical compound (Biaco) as compared with the other acaricids (amitraz, vertimec, perpol and salocide).

Regardless of fruits date cultivars good results were achieved when applied all acaroids, while Biaco 1-500 ml gave satisfaction results as compared with the other five compounds tested against the dust mite.

4-The reductions of the mite population on leaflets of botanical compound Bicao were 17.6, 3.8, 10.6 and 12.6.

Bicao ranked the first number, which Salocide EC (150 mL.) may indicate that they lost their efficacy when applied against this mite species on date cultivars of Nabotsif, Sokary, Kalas and Sakiey date varieties, (26.2, 14.40, 20.10 and 18.80) on leaflets respectively.