Wheat bulb fly (Delia coarctata, Fallén, Diptera: Anthomyiidae) larval response to hydroxamic acid constituents of host-plant root exudates

• Published in: Bulletin of entomological research 2013-06, Vol.103 (3), p.261-268
• Main Authors: Rogers, C.D., Evans, K.A.
• Format: Article
• Language: English
• Subjects: Animals; Anthomyiidae; Bioassays; Biological and medical sciences; Cereal crops; Chemotaxis - drug effects; Diptera - drug effects; Diptera - metabolism; Entomology; Fundamental and applied biological sciences. Psychology; Host plants; Hydroxamic Acids - metabolism; Insect control; Insecta; Insects; Invertebrates; Larva - drug effects; Larva - metabolism; Larvae; Pheromones - metabolism; Plant Exudates - metabolism; Plant Roots - chemistry; Poaceae - chemistry; Poaceae - parasitology; Research Paper; United Kingdom; Wheat
• ISSN: 0007-4853; 1475-2670; 1475-2670
• DOI: 10.1017/S0007485312000661

Wheat bulb fly (WBF, Delia coarctata, Fallén, Diptera: Anthomyiidae) is a pest of commercial importance in wheat, barley and rye, with attacked crops failing to produce full potential yields. Females do not oviposit in association with a host-plant; therefore, prompt location of a suitable host is critical to the survival of the newly hatched larvae. The objective of this study was to conduct choice test bioassays to assess the attraction of WBF larvae to specific chemical constituents of WBF host-plant root exudates, the hydroxamic acids DIMBOA (2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one) and MBOA (6-methoxy-benzoxazolin-2-one). The larval response to four concentrations of each test compound was assessed in arena bioassays. Analysis using a Rayleigh test of uniformity of the final resting positions of larvae in response to these chemicals indicated attraction. These results go some way to explaining the mechanisms by which WBF larvae locate host plants, giving the potential to develop semiochemical based control strategies.