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The predatory efficiency of four aquatic predators [Bufo regularis L., Orthetrum spp., Anisops sardea Herrich Schaeffer and Sigara selecta (Fiebre)] at three constant temperatures (15, 25 and 35°C) was evaluated on culicine larvae. Results showed significant variation in predation rate between the four predators at the three constant temperatures tested. Regardless of temperature, the predator Orthetrum spp. exhibited the highest active predators (18.1 larvae/day), followed by A. sardea ((12.2 larvae/day). B. regularis and S. selecta showed significant low predation rate (5.7 and 1.0 larvae/day). The predatory efficacy of the four predators was higher at 25 and 35°C than that at 15°C.

Performance of different herbicides and their combinations on weed control, growth and yield parameters of onion (Allium cepa L.

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.