Influence of Volatile and Nonvolatile Secondary Metabolites From Soybean Pods on Feeding and on Oviposition Behavior of <I>Euschistus heros</I> (Hemiptera: Heteroptera: Pentatomidae)

Abstract

Identification of chemical compounds extracted from host plants that act as oviposition stimulants for pest insects has gained importance, because of the compounds' potential use in the manipulation of insect behavior in the field. However, for generalist insects, such as phytophagous pentatomids, the chemical basis for the selection of the host is not well-known. Insect response can vary according to the soybean genotypes. Chemical profile of soybean pods of cultivars 'BRS 213', 'BRS 267', 'BR-16', and 'IAC-100' were compared regarding the feeding preference and oviposition of the stink bug Euschistus heros (F.). In the no-choice test, E. heros females showed longer feeding time on pods of BR-16 (132.6 min), followed by BRS 213 (128.0 min), BRS 267 (122.5 min), and IAC-100 (82.9 min). In the choice test, there was no significant difference in the feeding time among cultivars. In the oviposition test, females deposited 60% of eggs on the pods of BRS 267, followed by BRS 213 (27.3%), BR-16 (8.8%), and IAC-100 (3.9%). The chemical profile of BRS 267 including greater presence of reducing sugars and lack of isoflavone forms might explain the preference of E. heros to oviposite on it compared with the remaining cultivars tested.

Aqueous washings of host plant surface influence the growth inhibitory effects of δ‐endotoxins ofBacillus thuringiensisagainstHelicoverpa armigera

“…The differences in fecundity and the differential effect on the biological activity of Bt/Cry1Ac could be attributed to the differences in chemical composition of the washings. Plant surface chemicals have been reported to play an important role in insect oviposition (Chapman & Bernays, 1989;Green et al, 2003;Chamarthi et al, 2011;Hilker & Meiners, 2011;Silva et al, 2013). The present study suggested that surface chemicals play an important role in biological activity of Bt and/or Cry1Ac against H. armigera.…”

“…Chemicals on the surface of plant parts determine host acceptability and suitability of the host plant for development and survival of the insect pest (Chamarthi et al, 2011;Hilker & Meiners, 2011;Silva et al, 2013). Chemicals on the surface of plant parts determine host acceptability and suitability of the host plant for development and survival of the insect pest (Chamarthi et al, 2011;Hilker & Meiners, 2011;Silva et al, 2013).…”

“…Leaf, flower, pod, or grain surface is the first site for an encounter between insect pests and their host plants. Chemicals on the surface of plant parts determine host acceptability and suitability of the host plant for development and survival of the insect pest (Chamarthi et al, 2011;Hilker & Meiners, 2011;Silva et al, 2013). Amounts of malic and oxalic acids in leaf exudates in chickpea and pH alter the expression of resistance to H. armigera (Bhagwat et al, 1995;Yoshida et al, 1997;Narayanamma et al, 2008).…”

Preferences of the wheat bug (<i>Nysius huttoni</i>) for particular growth stages of the potential trap crop, alyssum (<i>Lobularia maritima</i>)

“…In general, the flowering stage of a plant releases more volatile chemicals (Ceballos et al 2015) and provides nutritional rewards to many generalist herbivores than other stages (Wäckers et al 2007). However, the type of volatiles and their concentrations can vary between growth stages (Silva et al 2013). Such volatiles emitted by alyssum flowers could be extracted and artificially produced in a laboratory.…”

Influence of Nitrogen Fertilisation on Red Spider Mites (Oligonychus coffeae Nietner) and Overhead Volatile Organic Compounds in Tea (Camellia sinensis)

“…For example, flea beetles (Epitrix hirtipennis) were more abundant on GLVproducing wild type plants compared to plants (55). Uschistus heros preferred soybean pods that released high amounts of GLVs for feeding and oviposition over deficient cultivars (56). The GLVs serve as feeding stimulants to pests (57).…”