Volatile semiochemical impact on trapping and distribution in maize of northern and western corn rootworm beetles (Coleoptera: Chrysomelidae)

Abstract

1 Field studies evaluated plant attractants and analogues as tools to move corn rootworm beetles (Diabrotica spp.) into areas to be treated with toxic baits for population suppression via mass removal/annihilation of reproductive adults. 2 When dispensed from sticky traps in maize, 2-phenyl-1-ethylamine and 2-phenyl-1-ethanol captured more northern corn rootworm, Diabrotica barberi, than did 4-methoxyphenethanol. Only 2-phenyl-1-ethanol attracted the western corn rootworm, Diabrotica virgifera virgifera, but not until maize matured beyond milk stage. 3 Attraction of D. barberi to the amine, alone or blended with 2-phenyl-1-ethanol, occurred before and after maize flowered but not during intervening silk or blister stages. Attraction recurred during early milk stage at or before 50% emergence of adult female D. barberi or D. v. virgifera, respectively, and before populations declined for the season. 4 Synergistic interaction of 2-phenyl-1-ethylamine with 2-phenyl-1-ethanol in attracting D. barberi females did not occur until maize matured to late milk stage. 5 The amine-alcohol blend (0.44 point sources m À2 ) doubled the density of D. barberi but not D. v. virgifera when applied to small plots within mostly milk-stage or younger maize. Traps without bait within attractant-treated plots captured more female, but not male, D. barberi than did traps in untreated control plots, hinting that females accounted for most of the observed increase in beetle density. 6 The results suggest that attractants can be used despite phenological limitations to concentrate preovipositional females within field areas and thus to complement a variety of corn rootworm control strategies.

Olfactory responses of Drosophila suzukii females to host plant volatiles

“…However, they also hint that semiochemicals can be effective depending on the developmental stage of the crop. Similar work by Hammack () shows that kairomones are effective if used at the right period of the crop phenology. Therefore, the unripe stage of fruit development would be the ideal period to use oviposition attractants and reduce the pest population by preventing oviposition.…”

Behavioral responses for evaluating the attractiveness of specific tea shoot volatiles to the tea green leafhopper, Empoaca vitis

“…Blend 2 showed much higher catches than did ( E )‐2‐hexenal, possibly due to the synergistic effect of components in blend 2. Some studies confirmed that the attractiveness of semiochemical mixtures are stronger than those of single components (Zhang et al , 1999; Hammack, 2003; Blackmer et al , 2004; Leskey et al , 2005; Pinero et al , 2006). One of our objectives in the current study was to determine attractiveness of individual and various blends of compounds found in host plants.…”

Alternaria toxin-induced resistance against rose aphids and olfactory response of aphids to toxin-induced volatiles of rose plants

“…2 and 3; Tables 1 and 2), the volatiles played an important role in selecting host plants. As abovementioned, fungi may induce the changes of plant volatiles so that insects are affected (Hammack, 2003). For instance, healthy Melaleuca quinquenervia leaves attracted more female Oxyops vitiosa weevils in olfactory bioassays when compared to the leaves infected with rust Puccinia psidii (Rayamajhi et al, 2006).…”