caa a22 4500 397571240 CHVBK 20180308164842.0 cr unu---uuuuu 161202e19961001xx s 000 0 eng 10.1093/ee/25.5.1077 doi (NATIONALLICENCE)oxford-10.1093/ee/25.5.1077 Effects of Soybean Trichome Density on Mexican Bean Beetle (Coleoptera: Coccinellidae) Development and Feeding Preference [Elektronische Daten] [Aron J. Gannon, Catherine E. Bach] The effect of trichome density on Mexican bean beetle, Epilachna varivestis Mulsant, development was studied using larvae reared on 3 soybean, Glycine max (L.) Merrill, isolines isogenic except for trichome density: glabrous, normal, and dense. Larvae completed the 1st instar most quickly on pubescent plants, whereas 3rd-instar duration was shortest on glabrous plants; however, total larval development did not differ significantly. Larvae reared on the glabrous isoline had 14-29% greater mean dry pupal weights than larvae reared on the dense and normal isolines. Finally, larval mortality was 2.5—5 times greater on the densely pubescent isoline compared with the glabrous and the normal isolines. Feeding preference, as determined by choice tests, also significantly varied among developmental stages. Firstinstar larvae caused 6-8 times more feeding damage on the pubescent isolines than on the glabrous isoline; whereas, 3rd and 4th instars caused 3-13 times more damage on the glabrous isoline than on the normal and dense isolines. Adults did not show a significant feeding preference. In addition, female beetles did not exhibit a significant oviposition preference. Overall, these results suggest that soybean trichomes may provide limited resistance against the Mexican bean beetle, particularly against older larvae. The lower pupal mass and increased mortality on isolines with trichomes also suggest that trichomes may influence the population dynamics of the Mexican bean beetle. © 1996 Entomological Society of America Population Ecology nationallicence Epilachna varivestis nationallicence Glycine max nationallicence development time nationallicence larval mortality nationallicence leaf pubescence nationallicence oviposition nationallicence Gannon Aron J. Department of Biology, Eastern Michigan University, Ypsilanti, MI 48197 aut Bach Catherine E. Department of Biology, Eastern Michigan University, Ypsilanti, MI 48197 aut Environmental Entomology Oxford University Press 25/5(1996-10-01), 1077-1082 0046-225X 25:5<1077 1996 25 ee https://doi.org/10.1093/ee/25.5.1077 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/ee/25.5.1077 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gannon Aron J. Department of Biology, Eastern Michigan University, Ypsilanti, MI 48197 aut NATIONALLICENCE 700 1- Bach Catherine E. Department of Biology, Eastern Michigan University, Ypsilanti, MI 48197 aut NATIONALLICENCE 773 0- Environmental Entomology Oxford University Press 25/5(1996-10-01), 1077-1082 0046-225X 25:5<1077 1996 25 ee Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford