Non-Conventional Treatments of Imidacloprid, Ascorbic acid, and Salicylic Acid against the Cotton Aphid Aphis gossypii (Glover)

Document Type : Original Article

Authors

1 plant protection institute research ,Agricultural Research Center Giza, Egypt .

2 Pesticides Department, Faculty of Agriculture, Mansoura University,

Abstract

The present study was conducted to investigate the effects of selected inducers, including salicylic acid (SA), ascorbic acid (ASA), and the insecticide imidacloprid (IMI), on the cotton aphid, Aphis gossypii. All treatments demonstrated strong to moderate effects against aphids. Notably, (ASA) applied at concentrations of 2 and 4 mM significantly increased shoot and root lengths compared to both (IMI) and (SA) treatments. In the first season, based on the overall mean reduction in aphid populations, (IMI) showed the highest significant reduction 64.12% and 67.58% at application rates of 3.5 and 7 g/kg of seed, respectively. This was followed by IMI at 1.75 g/kg and SA at 2 mM, which resulted in reductions of 61.04% and 60.51%, respectively. The lowest reduction was observed with (ASA) at 1 mM, which achieved only 39.01%. Among all treatments, T18 (S&F with IMI at 7 g/kg + 0.75g/L) was the most effective, reducing cotton aphid populations by 64.12%, followed by T17 (S&F with IMI at 3.5 g/kg +0.375g/L) with 58.91%, and T11 (S&F with SA at 2 mM) achieving a 54.60% reduction. In contrast, seed treatment with ASA at 1 mM was the least effective, showing only a 27.32% reduction in aphid populations. Treatments with IMI, SA, and ASA significantly increased polyphenol oxidase activity and total protein levels compared to the control. Moreover, seed treatment with ASA at 4 mM resulted in a highly significant increase in chlorophyll content specifically, chlorophyll A, chlorophyll B, and total chlorophyll content increased by 20.51%, 41.42%, and 29.79%, respectively.

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