The date palm, Phoenix dactylifera L. is an important fruit trees growing in the New Valley, Egypt. The old world date mite, Oligonychus afrasiaticus (McGregor, 1939) (Acari: Tetranychidae) is one of the most harmful pests of the date palms, due to the economic damage caused in the production of dates especially in the New Valley, Egypt. Thus, the efficiency of some recommended chemical compounds (i.e., abamectin (1.8% EC), chlorfenapyr (36% SC), fenopyroximate (5% EC), cyflumetofen (20% SC) and hexythiazox (10% WP) against the pest was evaluation under laboratory conditions. The experiments were carried out at the laboratory of the Plant Protection Department, Faculty of Agriculture, the New Valley University. The date fruits-dip bioassay method was used. The mortality percentages of the pest adult stages were recorded after 1, 6, 12 and 24-h exposure periods. Results of the LC 50 values of abamectin, chlorfenapyr, cyflumetofen, fenopyroximate and hexythiazox after 24-h were 0.05, 0.07, 0.13, 0.55 and 6.89 ppm, respectively. Abamectin was the most toxic one of all tested acaricides. The results showed that, the acaricides used are important tools in the control of the O. afrasiaticus on date palm trees.
Three new species (Caloglyphus punicum n. sp., C. azzai n. sp. and Myianoetus granatum n. sp.) represented only by their hypopial nymphs (heteromorphic deutonymphs), extracted from the soil under pomegranate trees, Assiut, Upper Egypt. The holotype deutonymph and paratype deutonymphs of each species are deposited in the
The date palm, Phoenix dactylifera L. (Arecaceae) is one of the most important fruit trees cultivated in the New Valley Governorate, Egypt. The old world date mite, Oligonychus afrasiaticus (McGregor, 1939) is considerd as a major pest of date palm orchards in the New Valley Governorate. Herein, the toxicity of five recommended acaricides [abamectin (1.8% EC), chlorfenapyr (36% SC), fenopyroximate (5% EC), cyflumetofen (20% SC) and hexythiazox (10% WP)] were evaluated against the O. afrasiaticus in date palm, P. dactylifera (cultivar Siwi). Trials were conducted at the field of Plant Protection Department, Faculty of Agriculture, New Valley University. The recommended concentrations of each pesticide were evaluated on O. afrasiaticus adults. Results were recorded after 1, 3, 7, 14 and 21 days. Abamectin (1.8 % EC) and chlorfenapyr (36% SC) were considered the most potent pesticides among all the pesticides tested. The reduction percentages were 90.07 and 87.77, followed by fenopyroximate (85.22), cyflumetofen (79.94) and hexythiazox (62.89). These acaricides have been used as the first choice and considered encouraging trends in controlling O. afrasiaticus in the New Valley Governorate, Egypt.
A survey of mite fauna inhabiting citrus orchards in Abutig, Assiut Governorate, yielded the discovery of a new species, Heterodispus longisetae n. sp. (Acari: Scutacaridae). The new species is morphologically described and illustrated.
Two new mite species of the genus Caloglyphus Berlese, 1923 (Acari: Acaridae) are described and illustrated based on deutonymphal stages collected from mango orchards in Assiut, Upper Egypt. The new species, C. mangiferus sp. nov. and C. similares sp. nov., were extracted from soil samples under the mango trees. The new species are characterized by having a pair of short peduncles globosely setae situated dorsosublaterally on the idiosoma.
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