02391nas a2200193   4500008004100000020001400041245010800055210006900163260000900232300001200241490000800253520168700261653002001948100002201968700002801990700002502018700002802043856012602071       2010                        eng d  a0022-049300aInfluence of Tillage on Adult and Immature Pea Leaf Weevil (Coleoptera: Curculionidae) Densities in Pea0 aInfluence of Tillage on Adult and Immature Pea Leaf Weevil Coleo  cJune  a691-6970 v1033 aThe pea leaf weevil, Sitona lineatus (L.) (Coleoptera: Curculionidae), has been a major pest of pea, Pisum sativum L., in eastern Washington and northern Idaho since its introduction to the region in the early 1970s. Eggs are deposited in the spring on the soil surface and first instars hatch and move to pea root nodules, where larvae feed before they pupate and adults emerge in mid- to late summer. No-tillage practices are known to reduce pea leaf weevil colonization in pea, but the effects of tillage on larval densities and subsequent adult emergence have not been examined. During 2005, 2006, and 2007, we compared densities of colonizing adult and immature pea leaf weevils on pea plots grown using conventional tillage and no-tillage. In 2005 and 2006, emergence of adult pea leaf weevil was monitored in the same plots. Densities of colonizing adult and immature pea leaf weevil were significantly higher in conventional tillage plots. Larvae in conventional tillage were further along in development than larvae in no-tillage plots during June and July. Densities of emerging adult pea leaf weevil were significantly greater from conventional tillage than no-tillage plots. Based on densities of colonizing and subsequent emerging adults, survival of weevils from egg through adult was greater in conventional tillage plots. Soils under no-tillage are cooler, resulting in later emergence of the pea crop and delayed root nodule development, possibly affecting the ability of first-instar pea leaf weevil to locate host plant roots. Our results indicate no-tillage fields are less suitable for pea leaf weevil colonization and survival than conventional tillage fields.10aSitona lineatus1 aHanavan, Ryan, P.1 aBosque-Perez, Nilsa, A.1 aSchotzko, Dennis, J.1 aEigenbrode, Sanford, D.  uhttps://weevil.myspecies.info/influence-tillage-adult-and-immature-pea-leaf-weevil-coleoptera-curculionidae-densities-pea02604nas a2200205   4500008004500000020001400045245014900059210006900208260001200277300001400289490000800303520180900311653002002120100002202140700002802162700002502190700002102215700002802236856013402264       2008                        Engldsh    a0022-049300aEarly-season aerial adult colonization and ground activity of pea leaf weevil (Coleoptera: Curculionidae) in pea as influenced by tillage system0 aEarlyseason aerial adult colonization and ground activity of pea  cOctober  a1606-16130 v1013 aThe pea leaf weevil, Sitona lineatus (L.) (Coleoptera: Curculionidae), is an important pest of pea, Pisum sativum L., in northern Idaho. Previous research revealed greater relative pea leaf weevil abundance and feeding damage in peas grown using conventional-tillage compared with no-tillage practices. However, the effects of tillage practices on early season colonization and activity by the pea leaf weevil on pea are not fully understood. Aerial traps and pitfall traps were used to assess adult colonization and relative density of adult pea leaf weevil into conventional-tillage and no-tillage pea in northern Idaho during 2005 and 2006. Feeding damage to the crop also was evaluated. During both years, aerial traps captured more pea leaf weevil in May, when crop establishment and early growth occurred, than in later months. Significantly more adult pea leaf weevils were captured in aerial traps in conventional-tillage than in no-tillage plots in May of both years. Significantly more pea leaf weevil were captured in pitfall traps in conventional-tillage plots than in no-tillage plots during the period immediately after peak aerial adult colonization in late May and early June. Crop feeding damage was significantly greater in conventional-tillage than in no-tillage plots in late May and early June. The patterns suggest that more adult pea leaf weevil colonize conventional-tillage pea than no-tillage pea. Pea plants in conventional-tillage emerged earlier and were larger than those in no-tillage during the pea leaf weevil colonization period, possibly accounting for the differences in colonization rates. This leads to greater early season pea leaf weevil infestation of conventional-tillage plots at a critical period for pea development that might ultimately influence crop yield.10aSitona lineatus1 aHanavan, Ryan, P.1 aBosque-Perez, Nilsa, A.1 aSchotzko, Dennis, J.1 aGuy, Stephen, O.1 aEigenbrode, Sanford, D.  uhttps://weevil.myspecies.info/early-season-aerial-adult-colonization-and-ground-activity-pea-leaf-weevil-coleoptera-curculionidae