Monitoring of Certain Piercing- Sucking Insect Pests and their Controlling on Eggplant

Abstract

Two field experiments were conducted to study the population dynamics of whitefly, Bemisia tabaci (Genn.) and the cotton mealybug, Phenacoccus solenopsis Tinsley .The efficacy of some insecticides against these insect pests infesting eggplant plants were evaluated at Sharkia Governorate during the two successive seasons of 2016 and 2017. The obtained results revealed that B. tabaci recorded four peaks of abundance and the highest peak was the fourth one during 2016 and2017 seasons, respectively. Moreover, P. solenopsis recorded two peaks in the first season 2016 and the highest peak was the second one, while in the second season 2017, it had three peaks and the highest peak was the third one. The infestation of these insect pests was more abundant in the second season than in the first one, which may be due to the influence of the studied climatic factors. Moreover, results showed that Lambada-cyhalothrine+thiamehoxam and imidacloprid were the most efficient insecticides against B. tabaci followed by pyriproxyfen, abamectin+thiamethoxam, buprofezin and spiromesifen, which classified as moderately toxic against the tested insect during the two seasons, respectively. And also, results indicated that thiamethoxam and abamectin were the most toxic insecticides against P. solenopsis followed by imidacloprid, emamectin benzoate, pyrethrins and chlorpyrifos in both seasons, respectively. This study might leads to understand the ecology of these pests which will help in designing the integrated pest management programs for their control. On the other hand, it shows the role of systemic insecticides which are less harmful to natural enemies.

Ffectof Barley Varieties and Potassium Fertilization Levels on the Population of Aphid and Leafhopper in Relation to Plant Chemical and Anatomical Changes

“…The obtained results are in agreement with those of , Hegab, Ola (2001) and Pherson et al (2009) who reported that the varieties of maize plants had a great effect on the incidence of some homopterous insects.…”

“…al. (2001) , Hegab Ola (2001), El Gindy (2002, Hashem (2005); Scott and Gratton (2006) 14.76, 15.81 and 16.90 %, 31.8, 34.9 and 39.8 carbohydrates and 5.09, 5.44 and 5.76 pH value for the treatments of 50, 75 and 100 kg potassium sulfate/feddan, respectively.…”

“…The homopterous insects (aphids and leafhoppers) are economic pests of many agricultural crops in Egypt. Barley plants are infested by these insect pests which affect the quantity of yield as results of their direct feeding on plant, in addition, these insects are responsible for natural spread of several virus diseases to barley plants Hegab, Ola (2001). The fauna of these insects on maize fields was studied in Egypt by Hashem, (2005) who mentioned that the population density of the piercing-sucking insects were affected with the of epidermal cell size and sub epidermis cells wall.…”