Journal of Plant Protection Research

Rezk, M. A.; Hassan, A. T.; El-Deeb, Moustafa F.; Shaarawy, Nehal; Dewer, Youssef

doi:10.24425/jppr.2019.126042

Cited by 5 publications

References 31 publications

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Relative toxicity of two natural compounds compared to abamectin against some soybean pests under period rates

Alakhdar

Ghareeb

2021

OCL

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A sustainable pest management in agro-ecosystems requires parallel assessments of pesticide and natural compounds to control target pests. In the present study, a semi-field experiment was conducted to evaluate the relative toxicity of abamectin (Abamax), humic acid, and Chitosan Nano-Particles (C.N.Ps) against four soybean pests: Tetranychus urticae, Eutetranychus orientalis, Bemisia tabaci, and Phenacoccus solenopsis. The experimental treatments were arranged in a split-plot design with three replicates, where treatments were assigned to main plots and pest populations under different periods in the subplots. The obtained results and graphs demonstrated that there were considerable differences between the total numbers of pests after different periods of treatment. Generally, E. orientalis recorded the minimum pest number at all. Different tested compounds demonstrated a considerable correlation between the densities of the pests. T. urticae exhibited a significant correlation with the other three pests (E. orientalis, B. tabaci, and P. solenopsis). E. orientalis did not correlate with B. tabaci and P. solenopsis. The humic acid recorded the best effect on T. urticae after 3 days with a reduction of 85.45% and E. orientalis after 7 days 65.55%. However, Chitosan Nano-Particles (C.N.Ps) was the best for E. orientalis after 14 days (mortality 74.36%). In contrast, abamectin (Abamax) had a general mean of reduction of 91.17% against T. urticae, whenever, these compounds are promising for controlling T. urticae, E. orientalis, B. tabaci, and P. solenopsis. These results may be a supporting method to overcome some soybean pests. The findings are discussed within the context of integrated management of soybean pests under semi-field conditions.

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Relative toxicity of two natural compounds compared to abamectin against some soybean pests under period rates

Alakhdar

Ghareeb

2021

OCL

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Phenacoccus solenopsis (cotton mealybug)

Watson¹

2020

CABI Compendium

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Antennal sensory structures of Phenacoccus solenopsis (Hemiptera: Pseudococcidae)

El-Ghany

Zhou²,

Dewer

2022

Front Zool

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Background The cotton mealybug Phenacoccus solenopsis Tinsley (Hemiptera: Pseudococcidae) is one of the most devastating sap-sucking pests of cultivated plants. The success of P. solenopsis is attributable to its ecological resilience and insecticide resistance, making its control extremely difficult and expensive. Thus, alternative safe approaches are needed to prevent the pest population from reaching the economic threshold. One of these novel approaches is based on the fact that chemical communication via the olfactory system drives critical behaviors required for the survival and development of the species. This knowledge can be useful for controlling insect pests using traps based on semiochemicals. The antennae of insects are an invaluable model for studying the fundamentals of odor perception. Several efforts have been made to investigate the histological and ultrastructural organization of the olfactory organs, such as the antennae and maxillary palps, in many insect species. However, studies on the antennal sensory structures of Phenacoccus species are lacking. Furthermore, although enormous progress has been made in understanding the antennal structures of many mealybug species, the olfactory sensilla in the antennae of P. solenopsis have not yet been described. In this study, we describe, for the first time, the morphology and distribution of the antennal sensilla in male and female P. solenopsis using scanning electron microscopy. Results Our results revealed that the entire antennae length and the number of flagellar segments were different between the sexes. Eight morphological types of sensilla were identified on male antennae: trichoid sensilla, chaetic sensilla (three subtypes), basiconic sensilla (two subtypes), and campaniform sensilla (two subtypes). Six morphological types of sensilla were found on female antennae. Sensilla chaetica of subtype 2 and campaniform sensilla of subtype 1 were distributed only on male antennae, suggesting that these sensilla are involved in the recognition of female sex pheromones. The subtype 1 of sensilla chaetica was significantly more abundant on female antennae than on male ones, while subtype 3 was only located on the terminal flagellar segment of the antenna in both sexes. Conclusions This study provides insightful information for future electrophysiological and behavioral studies on chemical communication in insects, particularly the cotton mealybug, P. solenopsis that could help in developing new strategies for controlling this economically important insect species.

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Journal of Plant Protection Research

Cited by 5 publications

References 31 publications

Relative toxicity of two natural compounds compared to abamectin against some soybean pests under period rates

Relative toxicity of two natural compounds compared to abamectin against some soybean pests under period rates

Phenacoccus solenopsis (cotton mealybug)

Antennal sensory structures of Phenacoccus solenopsis (Hemiptera: Pseudococcidae)

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