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-vola02131nas a2200169   4500008004100000020001400041245013400055210006900189260000800258300001200266490000800278520146700286653002901753100001901782700002501801856013501826       2010                        eng d  a0931-204800aSpatial distribution of colonizing Listronotus maculicollis populations: implications for targeted management and host preference0 aSpatial distribution of colonizing Listronotus maculicollis popu  cMay  a275-2840 v1343 aWe characterized the spatio-temporal distribution of emerging overwintered adult Listronotus maculicollis populations colonizing golf course fairways with Spatial Analyses by Distance IndicEs (SADIE) with the goal to better target management tactics and to test assumptions for weevil preference for annual bluegrass (Poa annua). Adults randomly colonized and moved throughout fairways. However, cumulative captures were significantly aggregated along fairway edges closest to overwintering sites demonstrating progressive movement through the edges. Spatial association analyses suggest that the spatial patterns of cumulative captures of adults rather than weekly patterns were strongly associated with larvae, indicating that the adults enter fairways from the edges and deposit eggs over the course of several weeks. We did not observe an effect of host species on the distribution of either adult or larval L. maculicollis which leads us to question traditional assumptions of host preference for short mown P. annua. Instead, we propose that the aggregated distribution of larvae is generated by a low encounter rate of short mown hosts, rather than preference for species or cultivar. This study indicates that caution need to be applied when using preference-performance criteria in host preference studies. Future behavioural studies need to address the contributions of encounter rate and host species on L. maculicollis host selection and oviposition.10aListronotus maculicollis1 aMcGraw, B., A.1 aKoppenhoefer, A., M.  uhttps://weevil.myspecies.info/spatial-distribution-colonizing-listronotus-maculicollis-populations-implications-targeted-managemen02687nas a2200169   4500008004100000020001400041245014900055210006900204260001200273300001000285490000700295520199500302653002902297100002502326700003102351856013502382       2009                        eng d  a0929-139300aPopulation dynamics and interactions between endemic entomopathogenic nematodes and annual bluegrass weevil populations in golf course turfgrass0 aPopulation dynamics and interactions between endemic entomopatho  cJanuary  a77-890 v413 aEntomopathogenic nematodes (Rhabditida: Steinernematidae and Heterorhabditidae) (EPNs) are generalist obligate pathogens present in the soil of most ecosystems. They have the potential to infect a broad host range, yet the potential for endemic EPNs to regulate soil-dwelling insect populations has received limited attention. We investigated the population dynamics of endemic EPNs to determine their ability to regulate annual bluegrass weevil (Listronotus maculicollis) (Coleoptera: Curculionidae) populations, a major pest of turfgrass in the northeastern United States. Weekly sampling of nematode and L. maculicollis populations was conducted in untreated fairway transects on three golf courses in New Jersey between April and October of 2006 and 2007. Steinernema carpocapsae and Heterorhabditis bacteriophora were found infecting all weevil stages from third instar to teneral adults. Both EPN species exhibited a distinct seasonality, appearing in high densities in the weeks immediately following high densities of first generation weevils in the soil. A positive temporal relationship was observed between densities of EPN-infected weevils and weevil stages between third instar and pupa, but L. maculicollis generational mortality due to EPN infection was highly variable between years and sites, ranging between 0 and 50%. Although infection densities and larval densities were positively correlated, per capita mortality did not increase with increased weevil densities. EPN distribution dynamically cycled between aggregated and uniform throughout the season across fairways. Few significant relationships were found to support the hypothesis that weevil spatial dispersion influences EPN spatial dispersion. The variability in EPN seasonal occurrence and generational impact on L. maculicollis together with the lack of spatial association with L. maculicollis suggest an inability of endemic EPN populations to reliably regulate weevil populations on golf course fairways.10aListronotus maculicollis1 aMcGraw, Benjamin, A.1 aKoppenhoefer, Albrecht, M.  uhttps://weevil.myspecies.info/population-dynamics-and-interactions-between-endemic-entomopathogenic-nematodes-and-annual-bluegrass02276nas a2200169   4500008004100000020001400041245019300055210006900248260000900317300001400326490000800340520153800348653002901886100002501915700003101940856013501971       2009                        eng d  a0022-049300aDevelopment of Binomial Sequential Sampling Plans for Forecasting Listronotus maculicollis (Coleoptera: Curculionidae) Larvae Based on the Relationship to Adult Counts and Turfgrass Damage0 aDevelopment of Binomial Sequential Sampling Plans for Forecastin  cJune  a1325-13350 v1023 aBinomial sequential sampling plans were developed to forecast weevil Listronotus maculicollis Kirby (Coleoptera: Curculionidae), larval damage to golf course turfgrass and aid in the development of integrated pest management programs for the weevil. Populations of emerging overwintered adults were sampled over a 2-yr period to determine the relationship between adult counts, larval density, and turfgrass damage. Larval density and composition of preferred host plants (Poa annua L.) significantly affected the expression of turfgrass damage. Multiple regression indicates that damage may occur in moderately mixed P. annua stands with as few as 10 larvae per 0.09 m2. However, >150 larvae were required before damage became apparent in pure Agrostis stolonifera L. plots. Adult counts during peaks in emergence as well as cumulative counts across the emergence period were significantly correlated to future densities of larvae. Eight binomial sequential sampling plans based on two tally thresholds for classifying infestation (T = 1 and two adults) and four adult density thresholds (0.5, 0.85, 1.15, and 1.35 per 3.34 m2) were developed to forecast the likelihood of turfgrass damage by using adult counts during peak emergence. Resampling for validation of sample plans software was used to validate sampling plans with field-collected data sets. All sampling plans were found to deliver accurate classifications (correct decisions were made between 84.4 and 96.8%) in a practical timeframe (average sampling cost <22.7 min).10aListronotus maculicollis1 aMcGraw, Benjamin, A.1 aKoppenhoefer, Albrecht, M.  uhttps://weevil.myspecies.info/development-binomial-sequential-sampling-plans-forecasting-listronotus-maculicollis-coleoptera-curcu02694nas a2200193   4500008004500000020001400045245013400059210006900193260001300262300001400275490000700289520194400296653002802240653002902268100002202297700002502319700002102344856013502365       1999                        Engldsh    a0022-049300aSuitability of Listronotus maculicollis (Coleoptera: Curculionidae) as a host for Microctonus hyperodae (Hymenoptera: Braconidae)0 aSuitability of Listronotus maculicollis Coleoptera Curculionidae  cDecember  a1292-13000 v923 aMicroctonus hyperodae Loan is an effective parasitoid against Listronotus bonariensis (Kuschel) in New Zealand. To determine the potential for M. hyperodae as a biological control agent for L. maculicollis Dietz, live specimens were imported to a quarantine facility in New Zealand. A series of experiments examined the suitability of 3 South American geographic populations (ecotypes) of M. hyperodae in terms of parasitism rates, prepupal emergence, and development times compared with the natural host, L. bonariensis. Limited development occurred in L. maculicollis by all 3 ecotypes, but parasitism rate was significantly lower than in L. bonariensis. Comparison with a related parasitoid showed higher rates of prepupal emergence from L. maculicollis for M. aethiopoides Loan than for M. hyperodae. The presence of annual bluegrass, Poa annua, in the test arena and prior experience on L. maculicollis increased parasitism rate significantly when a combination of L. maculicollis and L. bonariensis were exposed to M. hyperodae. The low rate of successful prepupal emergence by M. hyperodae in L. maculicollis was attributed in part to a physiological response by L. maculicollis which led to encapsulation of the developing parasitoid egg and larva. Based on these results, M. hyperodae probably would not be a suitable biological control agent of L. maculicollis in the United States because of the low rates of parasitism observed under laboratory conditions and delayed development times compared with those in the natural host, L. bonariensis. M. aethiopoides is more successful in parasitizing and developing in L. maculicollis, but this parasitoid also exhibited significantly lower levels of parasitism compared with L. bonariensis, although development times were comparable. Furthermore, M. aethiopoides used in these trials probably originated in North Africa and may not be suited to a northeastern United States climate.10aListronotus bonariensis10aListronotus maculicollis1 aMcNeill, Mark, R.1 aVittum, Patricia, J.1 aBaird, David, B.  uhttps://weevil.myspecies.info/suitability-listronotus-maculicollis-coleoptera-curculionidae-host-microctonus-hyperodae-hymenoptera