| Title: | Fooling the Harlequin Bug (Hemiptera: Pentatomidae) Using Synthetic Volatiles to Alter Host Plant Choice |
| Author(s): | Thrift EM; Herlihy MV; Wallingford AK; Weber DC; |
| Address: | "USDA Agricultural Research Service, Invasive Insect Biocontrol and Behavior Laboratory, Beltsville, MD. Department of Entomology, Virginia Tech, Blacksburg, VA" |
| ISSN/ISBN: | 1938-2936 (Electronic) 0046-225X (Linking) |
| Abstract: | "Harlequin bug, Murgantia histrionica (Hahn) (Hemiptera: Pentatomidae), is a widespread pest that feeds on a variety of brassicaceous crops and other plants. To understand olfactory cues that mediate host-finding, and their possible utility in pest management, we deployed aggregation pheromone (mixed murgantiols = 10,11-epoxy-1-bisabolen-3-ols) and/or isothiocyanate (ITC) host plant volatiles with potted host plants and nonhost soybean, in field choice bioassays. Adults of both sexes were strongly attracted (10-31x) to collard host plants baited with pheromone lures, compared with unbaited collards, as were nymphs. Collard plants baited with lures containing allyl and/or benzyl-ITC showed a 1.3x and 1.9x increase in attractiveness, respectively, neither differing by life-stage nor sex; multiple lures showed additive attraction. Nonhost soybean, baited with pheromone lure, was 4.6-7.5x more attractive to adults than unbaited collard; conversely, baited collard was 124x more attractive than unbaited soybean. The stark difference in observed effect of pheromone lure between unpoisoned plants, and those poisoned with imidacloprid, indicated that attraction was underestimated by circa-daily counts of unpoisoned plants, presumably because if not poisoned, bugs rapidly abandoned the baited nonhost soybean plant. Results indicate that harlequin bugs can be misled to encounter and feed on nonhosts by their aggregation pheromone, but additional means may be needed to retain them. Attraction to hosts is increased both by the aggregation pheromone, and at least two host plant volatiles, allyl and benzyl-ITC. These results contribute to our knowledge of host finding in harlequin bug, and to possible trapping and trap cropping schemes for pest management" |
| Keywords: | "Animals Behavior, Animal/*drug effects Brassica Female Hemiptera/*drug effects Herbivory Insect Control/*methods Isothiocyanates/*pharmacology Male Pheromones Sesquiterpenes/*pharmacology Soybeans;" |
| Notes: | "MedlineThrift, Emma M Herlihy, Megan V Wallingford, Anna K Weber, Donald C eng Evaluation Study England 2018/03/06 Environ Entomol. 2018 Apr 5; 47(2):432-439. doi: 10.1093/ee/nvy013" |
