Influence of Reproductive Ecology on Feasibility of Mass Trapping Diabrotica virgifera virgifera (Coleoptera: Chrysomelidae)

Modeling Evolution of <I>Diabrotica virgifera virgifera</I> (Coleoptera: Chrysomelidae) to Transgenic Corn With Two Insecticidal Traits

“…Most females cease calling for males within 24 h of insemination (Hammack 1995), and insemination causes most females to be either unattractive or unreceptive to males (Hill 1975, Branson et al 1977. The protandrous adult males emerge earlier than the females and thus are ready to mate as soon as females emerge (Quiring and Timmins 1990). Branson et al (1977) observed that males could mate an average of eight times during a 42-d period; however, Quiring and Timmins (1990) found that males can mate up to 17 times during their lifetimes.…”

“…The protandrous adult males emerge earlier than the females and thus are ready to mate as soon as females emerge (Quiring and Timmins 1990). Branson et al (1977) observed that males could mate an average of eight times during a 42-d period; however, Quiring and Timmins (1990) found that males can mate up to 17 times during their lifetimes.…”

Volatile semiochemical impact on trapping and distribution in maize of northern and western corn rootworm beetles (Coleoptera: Chrysomelidae)

“…First, mass removal or annihilation of reproductive adults would be most effective for controlling pest populations if done before females begin to lay eggs. Oviposition by D. barberi, as well as D. v. virgifera, generally begins about 10-14 days after adult emergence from the soil, a process which tends to peak in both species around flowering, with females appearing several days later on average than males (Hein & Tollefson, 1985;Quiring & Timmins, 1990;Elliott et al, 1991). Second, even though removal/annihilation of females beginning during silk or blister stage would probably Table 2 Counts per maize plant of northern (NCR) and western corn rootworm (WCR) beetles, Diabrotica barberi and Diabrotica virgifera virgifera, respectively, in semiochemical treated plots (T) and excess counts in treated compared with control (C) plots Semiochemical impact on trapping and distribution in maize 119 prevent oviposition more effectively than during later stages, milk stage was as soon after flowering that significant recovery of D. barberi responsiveness to the amine and the amine-alcohol blend was demonstrated here.…”

In-Field Labeling of Western Corn Rootworm Adults (Coleoptera: Chrysomelidae) with Rubidium

“…Quiring and Timmins (1990) concluded that most females mated within the Þrst 24 h after emergence and observed that some females only moved within a few meters of their emergence site for mating. These observations, along with results from our laboratory experiments, do suggest that initial Rb concentrations could be signiÞcantly elevated if newly emerged beetles fed on Rb-enriched corn plants in the vicinity of their emergence site.…”