Plant Protection

The present study was designed and compares the efficacy of three Pesticides against the buffaloes lice (Haematopinus tuberculatus) infesting buffalo in the farmer houses in Sohag Governorate .The pesticides which treated were Malathion 57%, Diazinon15% and Diazinon 60% EC at concentration of ml/ liter water against lice. The pesticides were spray on all treatment and the animal examined was after 24 hrs till 45 days. The decrease or increase of the population at buffalo lice was estimated and comparison between the three pesticide. Diazinon 60% showed variable toxicity to animal parasites. According to the percentage of mortality recorded after24 hrs till 45 days followed by Malathion 57% with the same concentrations. The late efficiency was Diazinon 15%.This may be due to the low of the active ingredient in Diazinon 15% compared with Diazinon 60%.In general we can use Diazinon 60% with 1cm/liter water as spray on the animal body to control the buffalo lice.

Survey of ectoparasites infesting the grey bellied rat, Rattus rattus alexandrinus (L.) at Sohag and Assiut districts was conducted during the period from Feb. 2019 to Jan. 2020. In the two areas, survey exhibited presence of three species of mites viz., Dermanyssus sp., Glycyphogus sp. and Ornithonyssius sp., one species of hart tick, Hyalomma sp., two species of fleas, Xenopsylla cheopis (Rothschild) and Pulex irritans (L.) and one species of lice Poolyplax spinulosa (Brumeister). Results of population fluctuation showed that the ectoparasites (lice, fleas and mites) were recorded with variable densities in the two areas. The highest density was recorded during spring and summer months, whereas the lowest one was recorded in winter. Lice showed the highest density followed by mites, then fleas. In Sohag area, lice showed the highest percentage of ectoparasites captured (50%) followed by mites (40%), fleas showed the lowest percentage (10%). In Assiut area, also lice showed the hig...

Seasonal abundance of the two spotted spider mite, Tetranychus urticae (Koch) (Acari) infesting cucumber plants in Upper Egypt was studied during three seasons of 2014, 2015 and 2016 in Assiut Governorate. The obtained results showed that the spider mite, T. urtica population during spring plantations fluctuated in relatively high densities during whole season with a peak during the middle of May when the plant age was 43 day-old and the presence of an average level of temperature and relative humidity. In addition, the data indicated that the number of predators was not significantly correlated with pest populations during the spring plantations of 2015 and 2016 seasons, probably because of the lowest numbers of predators recorded in the studied area. The present study showed that the cucumber plants severely affected by the two spotted spider mite, T. urticae . In addition to the scarce numbers of predators recorded during spring and/or summer plantations.

The effect of light, water temperature and pH on the predation efficiency of Gambusia affinis (Baird and Girard) on Culex pipiens L. (Diptera: Culicidae) mosquito larvae was studied under laboratory conditions. Significant predation rate was recorded in light than in darkness for both male and females, despite fish size. The temperature 30°C showed the most favorable degree for predation compared with 25 and 35°C. Also, the predatory efficiency of G. affinis on mosquito larvae was significant at pH 9 than on 7 and 12.  The present results should be taken in consideration in biological control of mosquito larvae.