Citrus Leafminer Management: Jasmonic Acid versus Efficient Pesticides

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.

Comparative study on growth, physiological and biotic stress resistance of cucumber (Cucumis sativus L.) by exogenous application of jasmonic acid and methyl jasmonate under greenhouse conditions

“…One of the main reasons why JA compounds can increase the phenolic content of plant cell is that JA and MeJA can increase the expression of PAL activity through the octadecane pathway (Singh et al 2021). In our results, PAL activity was signi cantly positively correlated with phenol and tannin content and was consistent with many results (Abdul et al 2014;Vivek et al 2019;Bali et al 2019;Elazab et al 2020). Furthermore, we did not nd a signi cant difference in the effects between MeJA and JA on PAL activity, regardless of whether they were faced with aphid feeding.…”

“…As long as aphid feeding conditions was involved, the contents of total chlorophyll, chlorophyll a, chlorophyll b and carotenoids decreased signi cantly. Contrary to expectations, we did not nd that JA compounds could signi cantly increase the content of photosynthetic pigments under aphid stress, and it is inconsistent with most ndings (Ali et al 2020;Awan et al 2020;Elazab et al 2020). However, this result is not incomprehensible, as aphid feeding can lead to photosynthesis problems, down-regulate some photosynthesis genes, and also induce leaf chlorosis, which is manifested by reduced chlorophyll content (Liang et al 2018;Liu et al 2020).…”

“…The photosynthetic pigments (chlorophyll a, chlorophyll b and carotenoids) were used ethanol acetone extraction method and spectrophotometric method to determination (Elazab et al 2020). The measure of all parameters was repeated 5 times, and the mean value was taken.…”

“…Jasmonic acid (JA) has been widely known by researchers as a defensive phytohormone distributed in plants since its discovery from jasmine oil in the 1960s and has been shown to have various regulatory effects on plants, including growth, photosynthesis effects and responses to biotic and abiotic stresses (Sandra et al 2009;Wastenack 2015;Elazab et al 2020). JA's research is closely related to another terminology "induced resistance"(IR) which refers to the self-defense mechanism activated by plants itself after being attacked by herbivores, but it can also be activated by plant hormones such as JA and salicylic acid (SA) (Stout et al 1998;Karban & Baldwin 1999;Kawazu et al 2012).…”

High Concentration of CO2 Improve the Pb Resistance of Oryza sativa L. Seedlings by Enhancing Photosynthesis and Regulating Plant Endogenous Hormones

“…JA and SA play important roles in photosynthesis, growth and development, seed germination, and flowering. In addition, they also play an important role in plant stress resistance (Elazab et al 2020;Wasternack 2015;Khan et al 2003). Our results found an interesting circumstance, compared with AC, JA content increased significantly in all treatments of rice seedling leaves, while SA content did not change significantly in all treatments.…”