02458nas a2200181   4500008004500000020001400045245013900059210006900198260001300267300001400280490000700294520174400301653002902045100002702074700001902101700002102120856013502141       2008                        Engldsh    a0046-225X00aPatterns of variation in the seasonal dynamics of Listronotus maculicollis (Coleoptera: Curculionidae) populations on golf course turf0 aPatterns of variation in the seasonal dynamics of Listronotus ma  cDecember  a1438-14500 v373 aListronotus nuiculicollis (Kirby) is a burgeoning pest of Poa annua L. in the northeast United States. To develop an understanding of its spatial and temporal association with golf course landscapes, we described the patterns of variation in certain population parameters across site (Fayetteville and Ithaca, NY), year (2004-2006), curd management habitat (fairway, intermediate rough, rough). In weekly surveys along fairway transects, we sampled larvae (identified to instar) by soil core extraction and adults (identified to sex and maturation) by hand collection. Five instars were confirmed based on head capsule width measurements; there was no overlap among instars. Sex ratio was significantly male-skewed on the rough versus the fairway. Insect load, a measure of population size based on cumulative insect-days, varied from 3.0- to 18.5-fold across sites and years and averaged 8.7- and 8.0-fold greater on the fairway than rough for larvae and adults, respectively. Visual assessment of stage-specific population fluctuation curves revealed no divergence in adult males and females i.e., no evidence of protandry. Variation was greater by year than by site in terms of overall shape of the fluctuation curves, relative abundance of overwintered to spring and summer adults, population synchrony, and number of generations (two to three). Evidence of bimodal spring generations showed that early season population synchrony may be linked to the pattern of adults transitioning from overwintering to developmental habitats. The magnitude of variation in population dynamics underscores the relevance of decision-making strategies and has implications for improving both the spatial and temporal targeting of intervention tactics.10aListronotus maculicollis1 aDiaz, Maria, Derval C.1 aSeto, Masanori1 aPeck, Daniel, C.  uhttps://weevil.myspecies.info/patterns-variation-seasonal-dynamics-listronotus-maculicollis-coleoptera-curculionidae-populations-g02633nas a2200205   4500008004100000020001400041245017300055210006900228260000800297300001200305490000700317520181300324653002902137100002502166700002702191700002202218700002102240700003102261856013502292       2011                        eng d  a0046-225X00aBehavioral and Electrophysiological Responses of Listronotus maculicollis (Coleoptera: Curculionidae) to Volatiles From Intact and Mechanically Damaged Annual Bluegrass0 aBehavioral and Electrophysiological Responses of Listronotus mac  cApr  a412-4190 v403 aListronotus maculicollis Kirby is a highly destructive pest of low mown, cool-season turfgrasses in the northeastern United States and Canada. Behavioral and electrophysiological assays were conducted to identify compounds that may be useful in developing novel monitoring techniques. In Y-tube assays, males and females responded differently to volatiles from intact and clipped annual bluegrass (Poa annua L.). Females were significantly attracted to intact P. annua but repelled from clippings; males did not respond significantly to either treatment. Electroantennogram (EAG) recordings from both sexes showed a significant response to volatiles from both treatments. Gas chromatography mass spectrometry (GC-MS) identified 12 volatile compounds from P. annua of which nine were common to both intact plants and clippings. On average, seven-fold higher quantities of volatiles were collected from clippings than from intact plants (24.3 versus 3.4 ng/g of tissue/h). Eight compounds were released in significantly greater quantities from clippings of which 50% were the n-C6 compounds hexanal, (E)-2-hexenal, and (Z)-3-hexenyl acetate, commonly referred to as "green leaf volatiles" (GLVs). Only octanal was emitted in greater amounts from intact plants than clippings. These nine compounds were tested individually against male and female antennae. Both sexes displayed greatest sensitivity to nonanal, octanal, and (E)-2-hexenal, but a significant dose-D response relationship was observed with all compounds tested. These studies indicate that both sexes respond physiologically and that L. maculicollis females exhibit behavioral responses to host-plant volatiles. Future studies will need to assess the effects of individual compounds and component mixtures on L. maculicollis behavior in the field.10aListronotus maculicollis1 aMcGraw, Benjamin, A.1 aRodriguez-Saona, Cesar1 aHoldcraft, Robert1 aSzendrei, Zsofia1 aKoppenhoefer, Albrecht, M.  uhttps://weevil.myspecies.info/behavioral-and-electrophysiological-responses-listronotus-maculicollis-coleoptera-curculionidae-vola