The impact of insecticides on the cotton mealybug, Phenacoccus solenopsis (Tinsley): Efficacy on potato, a new record of host plant in Egypt
Mohamed Rezk 1, A-B
Nehal Shaarawy 3, C
Youssef Dewer 4, A,D,F  
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Scale Insects and Mealybugs Department, Plant Protection Research Institute, Sabahia Plant Protection Research Station, Agricultural Research Center, Alexandria, Egypt
Vegetables, Medicinal Aromatic and Ornamental Plant Pests Department, Plant Protection Research Institute, Agricultural Research Center, Cairo, Egypt
Antoniadis Garden, Forestry and Wood Technology Department, Horticulture Research Institute, Agricultural Research Center, Alexandria, Egypt
Bioassay Research Department, Central Agricultural Pesticide Laboratory, Sabahia Plant Protection Research Station, Agricultural Research Center, Alexandria, Egypt
A - Research concept and design; B - Collection and/or assembly of data; C - Data analysis and interpretation; D - Writing the article; E - Critical revision of the article; F - Final approval of article
Youssef Dewer   

Bioassay Research Department, Central Agricultural Pesticide Laboratory, Sabahia Plant Protection Research Station, Agricultural Research Center, Alexandria, Egypt
Online publish date: 2019-03-18
Submission date: 2018-07-16
Acceptance date: 2019-02-28
Journal of Plant Protection Research 2019;59(1):50–59
The cotton mealybug, Phenacoccus solenopsis (Tinsley) (Hemiptera: Pseudococcidae), has become a widespread pest causing serious losses in several economically important crops, particularly cotton. To the best of our knowledge this is the first record of cotton mealybug, P. solenopsis as a new pest of potato plants in Egypt. The insect was noticed on potato plants for the first time during the growing season of 2016 (mid-August 2016). Mealybug specimens were collected from infested potato plants and identified as P. solenopsis. In an attempt to control this insect pest species, seven insecticides viz. sulfoxaflor, abamectin + thiamethoxam, spirotetramat, thiamethoxam, imidacloprid, buprofezin, and pymetrozine, belonging to different chemical groups, were tested for their effect against nymphs and adult females of P. solenopsis on potato under field conditions. The obtained results indicated that sulfoxaflor, abamectin + thiamethoxam and spirotetramat had the highest efficacy against P. solenopsis recording 80.3–96.05% reduction of the insect population after 21 days of application. Thiamethoxam, imidacloprid, buprofezin and pymetrozine failed to exhibit sufficient P. solenopsis control.
The authors have declared that no conflict of interests exist.
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