Experiments were carried out at Diarb Negim district, Sharkia Governorate to study certain piercing sucking pests infestation and their associated predators on cucumber plants during two successive seasons 2014-2015 and 2015-2016. The dominant insect pests were cotton aphid, Aphis gossypii Glover, whitefly, Bemisia tabaci (Genn.), Thrips tabaci (Lindquist) and a few numbers of Jassid as well as Nezara viridula F. Whereas, the prevailing associated predators were Orius spp., Metasyrphus corollae F., Chrysoperla carnea (Steph.), Coccinella undecimpunctata L. and a few number of Paederus alfierii (Koch) and true spiders. The infestation with A. gossypii and B. tabaci were much higher in autumn plantations than in summer plantations in both seasons of study, while, T. tabaci could be detected in few number on cucumber plants during autumn plantation in both seasons. In autumn plantation, Orius spp. had two peaks of activity in both years. The two peaks were recorded on the 1st and the 3rd November (17 and 23 individuals/30 leaves, resp.) in 2014 season and (9 and 12 individuals/30 leaves) in 2015 season. In the same regards, during summer plantation, Orius spp. had two peaks of activity on the 2nd of May and the 1st of June (48 and 31 individuals/30 leaves) in2015 season. Also, Metasyrphus corollae had two peaks of activity on 4th of April and 1stof May (3 and 17 individuals/30 leaves. Chrysoperla carnea had two peaks of activity on 2 nd and 4th of May (3 and 15 individuals/30 leaves).Statistical analysis showed that temperature and relative humidity were significant with some insects and insignificant with the others.
The present study was conducted to survey and population density of aphid Aphis gossypii Glover (Homoptera: Aphididae) infesting cucumber plants and its parasitoids were investigated at Diarb Nigem district during two season 2015 and 2016. Three primary parasitoids Lysiphlebus fabarum (Marshall), Diaeretiella rapae (M Intosh) and Binodoxys angelica (Haliday) and a hyperparasitoid, Pachyneuron sp. ((Hymenoptera: Aphidiidae)), were recorded. Primary parasitoid Lysiphlebus fabarum was the highly dominant species by relative density 53.76 and 52.24%, followed by D. rapae 22.58 and 27.73%, Binodoxys angelica 15.06 and 12.14%, while the hyperparasitoid , Pachyneuron sp., occurred by 8.60 and 7.89%, during 2015 and 2016 seasons respectively. The percentage of parasitism ranged from 3.14 % to 21.0 % in 2015, while it is starting by 2.66 % to reach its maximum 42.66% in 2016. Total developmental period of the parasitoid Lysiphlebus fabarum was 14.67 ± 1.16 days at 18.30°C ±1°C and 64 ±2RH%. Investigation the behaviour of the same parasitoid Lysiphlebus fabarum at varying host densities showed increase number of sting and number of mummies increased with increase of host density but decrease leaf arrival times and host arrival times with increasing. The obtained results showed that the longevity of the parasitoid Lysiphlebus fabarum was affected by temperature and food supply.
The journal of Toxicology and pest control is one of the series issued twice by the Egyptian Academic Journal of Biological Sciences, and is devoted to publication of original papers related to the interaction between insects and their environment. The goal of the journal is to advance the scientific understanding of mechanisms of toxicity. Emphasis will be placed on toxic effects observed at relevant exposures, which have direct impact on safety evaluation and risk assessment. The journal therefore welcomes papers on biology ranging from molecular and cell biology, biochemistry and physiology to ecology and environment, also systematics, microbiology, toxicology, hydrobiology, radiobiology and biotechnology. www.eajbs.eg.net Provided for non-commercial research and education use. Not for reproduction, distribution or commercial use.
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