A Model for Predicting Boll Weevil (Coleoptera: Curculionidae) Overwintering Survivorship

Effects of Planting Dates on Boll Weevils (Coleoptera: Curculionidae) and Cotton Fruit in the Subtropics

“…2003. c of DD would require intimate knowledge of overwintering habitat and insulation, and ambient air temperatures overestimate positive DD by 6.5Ð15.7% (Parajulee et al 1997). Stone et al (1990) reported that, over a 7-yr study, the variation in emergence patterns can be Ͼ30 d. Although Parajulee et al (2001) developed a model for boll weevil survivorship on the Rolling Plains, overwintering habitats, food sources (Chandler and Wright 1991), the timing of weevil entry into overwintering habitat (Sterling 1971, Wade and, the date at which to begin calculating DD (Parajulee et al 1996), and the relative incidence of diapause, among other conceivable parameters, would differ in subtropical and tropical conditions where boll weevils are active and reproducing year-round (Guerra et al 1982).…”

The Conundrum of Chemical Boll Weevil Control in Subtropical Regions

“…It is surprising that boll weevil surveillance fails to account for in-season changes in adult boll weevil response to grandlure largely predicated by cotton plant phenology and associated volatiles. One change occurs as cotton begins to square; then, even while boll weevils are accumulating in cotton fields, few are collected in the traps (Parajulee et al, 2001), presumably a result of competing plant volatiles from large fields of cotton versus a point pheromone source. Further, the trap's physical design presents a series of obstacles that boll weevils must negotiate before finding their way into a plastic cap on top where the weevils are counted (Showler, 2007).…”