cis-Jasmone treatments affect multiple sucking insect pests and associated predators in cotton

Cotton treatment with methyl jasmonate at different growth stages reduces the population of sucking insect pests and marginally increases their associated predators

“…In previous studies, MEJA-treated wheat and soybean plants were repellent to phytophagous thrips (Selig et al, 2016;Bayram & Tonğa, 2018a). Playing distinct bio-activating roles in plants, jasmonic acid (JA) and cis-jasmone (CJ) reduced the abundance of several thrips species in various host plants such as arabidopsis, cotton, wheat, tomato, and Brassica rapa L. (Omer et al, 2001;Thaler et al, 2001;Abe et al, 2008Abe et al, , 2009El-Wakeil et al, 2010;Bayram & Tonğa, 2018b;Tonğa et al, 2020). Similarly, laboratory experiments showed that CJ-and MEJA-treated faba bean plants and leaf discs had dose-dependent deterrent effects on feeding, oviposition, and settlement of the western flower thrips, Frankliniella occidentalis (Pergande) Egger et al, , 2016.…”

“…Thus, we revealed the effects of factors involved in the model on insect abundance. In the initial model, MEJA dose, plant stratum, and plant growth stage were set as fixed factors, whereas sampling date was considered as a random factor (Bayram et al, 2007;Bayram & Tonğa, 2018a,b;Tonğa et al, 2020). Likelihood ratio (LR) tests were done for the effects of fixed factors (α = 0.05).…”

“…The first, second, and third treatments were applied at the plant growth stages: (1) 6-8 true leaves-early squaring (GS1: 28 June 2013 and 26 June 2014), (2) square bud stage (GS2: 20 July 2013 and 12 July 2014), and (3) boll forming stage (GS3: 16 August 2013 and 4 August 2014), respectively. Three MEJA treatments were applied based on previous studies suggesting that multiple exogenous jasmonate treatments are required in field conditions to sustain induced plant defense throughout the season (Williams et al, 2017;Bayram & Tonğa, 2018a,b;Tonğa et al, 2020).…”

“…As inducible plant responses, volatile organic compounds (VOCs) play crucial roles for predators in locating suitable prey or hosts, on herbivore-infested host plants. For example, the predatory seven-spotted ladybird, Coccinella septempunctata L. (Coleoptera: Coccinellidae), and the common green lacewing, Chrysoperla carnea (Stephens) (Neuroptera: Chrysopidae), employ VOCs released by elicitor-or herbivore-induced plants and traps loaded with such compounds in field conditions, and prefer these compounds over control arms in olfactometer studies (Zhu et al, 1999;Al Abassi et al, 2000;Zhu & Park, 2005;Yu et al, 2008Yu et al, , 2018Williams et al, 2017;Bayram & Tonğa, 2018a,b;Tonğa et al, 2020). The compound MEJA serves as an indirect defense cue for ladybirds, e.g., MEJA-treated persimmon plants (Diospyros kaki L.…”

“…Therefore, each cotton growth stage might require specific attention in terms of pest management practices. Thus, to control continuous populations of insect pests at subsequent growth stages, several exogenous elicitor treatments may be required (Williams et al, 2017;Bayram & Tonğa, 2018a,b;Tonğa et al, 2020). In addition, the feeding preference of insect pests and their natural enemies within a plant can affect the accurate quantification of insect population densities.…”