The green lacewing, Chrysoperla carnea (Stephens) is considered one of the most effective predators with commercial viability for usage in many agricultural systems against a variety of crop pests. Results showed that after 24 h of exposure the LC 50 values for chlorpyrifos, lambada-cyhalothrin, abamectin, acetamiprid, lufenoron (72h) and methomyl were 0.201,4.66, 25.86,71.54,258.93 and 388.37 mgL -1 , respectively. Chlorpyrifos was the most toxic among the pesticides studied. In consideration of the developmental time of the 2 nd instar larvae treated with sublethal concentration (LC 10 ) revealed a significant difference between treats of all tested pesticides compared to untreated control. Plus, no significant difference was observed among lambada-cyhalothrin, abamectin, acetamiprid, and lufenuron treatments considering the larval developmental time. The developmental time of the 3 rd instars larvae treated with chlorpyrifos, lufenuron, and acetamiprid were not significant compared to the control treatment. For the pupae's developing time, the differences between treatments and controls were significant. The mean numbers of eggs of C. cephalonicus and Aphis craccivora Koch consumed by C. carnea 2 nd and 3 rd instar larvae significantly decreased after exposure of sublethal concentration of the selected insecticides compared to the control. In accordance with the results obtained, abamectin, lambada-cyhalothrin and lufenuron might be incorporated into integrated pest management (IPM) programs in combination with C. carnea for the control of sucking insect pests. Further, the use of chlorpyrifos, methomyl and acetamiprid in IPM strategies should be taken into consideration when releasing the green lacewing, due to the toxic effects observed under laboratory conditions.
The tenuipalpid mite, Tenuipalpus eriophyoides is recorded for the first time in Egypt. Moreover, re-description for males and females collected on leaves of palm trees is provided.
The study was carried out throughout two successive years (2016/2017 and 2017/2018) at Esna district, Luxor Governorate, to recognize the ecological effects of certain climatic factors on the plum scale insect pest, Parlatoria oleae (Colvee) on mango trees to specify the proper timing for control. The obtained results showed that the pest population of P. oleae occurred on mango trees all the years and had three peaks of seasonal activity per year, which was recorded in October, April and July during the first year (2016/2017) and through in November, April and July during the second year (2017/2018). Furthermore, the percentages of infestation incidence by pest showed three peaks per year, during November, April and July in both years. It seems that, the climatic conditions of autumn months during the two years were more suitable for the total population density and its activity and the maximum values of the infestation incidence by P. oleae. The obtained results showed that, the effect of weather factors (mean daily of air temperature, mean of relative humidity and mean of dew point) on the pest population and on the percentages of infestation incidence during the two successive years emphasized that the effect of these factors varied from year to another. Also, the dew point was the most effective variable for the changes in the pest population and the percentages of infestation incidence by the pest during both years and on the two cumulative years.Also, the rate monthly variation in the population (R.M.V.P) was calculated according to the formula reported by Serag-El-Din (1998):
Av. count of insect at a month (R.M.V.P) = ـــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــAv. count given at the preceding month Concerning, the effect of the main weather factors on the different stages of P. oleae population and percentages of infestation incidence. The meteorological data, viz. mean daily of air temperature, mean of % relative humidity and mean of dew point °C, for the conditions of Luxor governorate were obtained from the
The main objective of this work is to evaluate the relationship between the pest population, Parlatoria oleae (Colvee), through pest activity peaks in October/November; April and July on the yield loss of seedy Balady mango trees at Esna district, Luxor Governorate, Egypt through two seasons (2016/2017 and 2017/2018). Data revealed that the increment of population density caused gradual decrease of the yield of mango fruits, consequently increased the percentage of yield loss when the data of the yield were colligated with the pest population peaks in
The main objective of present study was to evaluate the toxicity of Malathion 57% EC, Potegon 20% SP, K.Z oil, and Neem (Azadirachta indica) extract AgNPs for controlling the cotton aphid, Aphis gossypii Glover (Hemiptera: Aphididae) and their effects on enzymes as indicators on soil fertility in tomato plants (Lycopersicum esculentum). The tested insecticides could be arranged in descending order according to their potency as follows: Malathion 57% EC > Potegon 20% SP > K.Z oil > Neem extract AgNPs. These compounds succeeded in controlling A. gossypii, where the means of reduction percentages of infestation were 79.92, 72.61, 73.18 and 72.52 %, respectively in the 2018/2019 season opposed to 76.09, 74.61, 72.97 and 71.38 %, respectively in the 2019/2020 season. The enzymes activity were not affected by the K. Z. oil, and Neem extract AgNPs applied on tomato plants. Mineral oil and plant extracts could form the basis for a successful formulation of bio-pesticides.
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