Effect of some insecticides alone and in combination with salicylic acid against aphid, Aphis gossypii, and whitefly Bemisia tabaci on the cotton field

Abstract

Background: Cotton is one of the most important industrial crops in Egypt and worldwide. During its growth stages, cotton is threatened by several pests including aphids (Aphis gossypii Glover) and whiteflies (Bemisia tabaci) which lead to deleterious effects on cotton growth, yield, and quality. Due to health and environmental hazards of pesticides, it is important to reduce them by using eco-friendly alternatives. Two field experiments were carried out to investigate the effect of some insecticides including profenofos (Prf), cyhalothrin (Cyh), and imidacloprid (Imd) individually or in combination with salicylic acid (SA) against cotton aphids and whiteflies. Results: All spray treatments had potent and moderated effects against aphids and whiteflies, respectively. The Prf insecticide at 100% of the recommended dose was the most effective one against both pests followed by the Cyh. The insecticidal effect of SA against the tested pests was concentration dependent. The most effective combination treatments were Prf at 75% of recommended dose + SA at a concentration of 1 mM for aphids (reduction % 95.68), and Cyh at 75% of recommended dose + SA (0.5 mM) for whiteflies (reduction of 88.00%). All tested insecticides, individually or in combination with SA, significantly increased total phenolic (TP) content in treated plants compared with control. The maximum increase in TP content was recorded in cotton plants treated with Prf in combination with SA. Conclusions: Salicylic acid enhanced the effectiveness of the used insecticides, and thus, SA could be used to lower the amount of insecticides with increasing insecticidal efficacy.

Relationship between viruliferous Bemisia tabaci population and disease incidence of Pepper yellow leaf curl Indonesia virus in chili pepper

“…Nymph population experienced sharp decline after 10 WAP up to13 WAP. The decline in the nymph population was caused by insecticide application performed by the farmers, high rainfall conditions, and the presence of parasitoids in the field (El-Sherbeni et al 2019). The population of parasitoid Eretmocerus sp.…”

Bemisia tabaci MEAM1 still remains the dominant species in open field crops in Brazil

“…However, insecticide resistance was reported in MEAM1 to different insecticides in Brazil (Silva et al, 2009;Dângelo et al, 2018). Insecticide susceptibility of species is a factor that needs to be known because it may drive the competition among MEAM1 and MED species and their distribution in different areas and crops in Brazilian territory (Cordeiro et al, 2014;Horowitz et al, 2005;El-Sherbeni et al, 2019).…”

Efficacy of abamectin and thiamethoxam mixture against Bemisia tabaci in tomato and toxicity on male albino rats

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