Abstract

The citrus leafminer (Phyllocnistis citrella Stainton) is a significant pest for Citrus spp. worldwide. Hence, the effectiveness of jasmonic acid (JA) was compared to three pesticides, abamectin, thiamethoxam, and acetamiprid, against P. citrella infesting mandarin (Citrus reticulata L.) and lime (C. aurantifolia L.) seedlings. Mortality rate was significantly different due to JA and other pesticides treatments. Moreover, on the 3rd day after treatment, JA demonstrated the highest reduction percentage of leafminer (77.08 and 33.33%) on mandarin and lime, respectively. By the 10th day after treatment, JA and abamectin displayed 100% reduction in both plant species. Furthermore, the foliar application of JA enhanced the most vegetative characteristics in the treated seedlings, including growth rate (shoot length/root length), fresh and dry weights of shoot and root as well as the number of leaves/seedling. Moreover, soluble protein content was increased significantly under JA treatment in the two Citrus spp. Jasmonic acid showed a good biological activity, which gives a practical reason to recommend it to be integrated in pest management programs as an alternative product for controlling P. citrella.

Highlights

  • Citrus spp. (Fam.: Rutaceae) is an economically important fruit crop worldwide

  • On the 3rd day after treatment, jasmonic acid (JA) had the highest percentage of reduction on infestation on mandarin (77.08%) and lime (33.33%)

  • The most perceived trends in the study were; first, that the most well-defined reduction percentage was noticed in mandarin rather than a lime, in which the later was more interactive with treatments specially JA

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Summary

Introduction

(Fam.: Rutaceae) is an economically important fruit crop worldwide It is cultivated in an area of 9.8 million hectares with a global production exceeded 156 million tons in 2014 (FAO 2014). Abamectin is well-known for its controlling of citrus leafminer Other pesticides such as thiamethoxam and acetamiprid are worthy to be comparably involved in the study. They are a relatively new class of systemic insecticides with a relatedness to neonicotinoids which makes them act as the agonists to the nicotinic acetylcholine receptor (nAChRs) in a way different of other classes of insecticides. The unwise and uneven use of pesticides leads to the pesticide resistance issue In these regards, new control strategies must be developed to respond to this problem

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