| foraging resources of adult mexican corn rootworm (coleoptera: chrysomelidae) in bell county, texas. | pollen analyses were used to determine pollen foraging resources of adult mexican corn rootworms, diabrotica virgifera zeae krysan & smith, captured near temple, bell county, tx, in 1996 and 1997. in 1996, adult mexican corn rootworms were captured in a corn, zea mays l., field. in 1997, nine locations outside of cornfields were added. overall, 92% of the beetles (n = 1,323) contained pollen. more than 142,000 pollen grains were counted, representing 45 families, 63 genera, and 27 species. overa ... | 2000 | 10902309 |
| polymorphic microsatellite loci from northern and mexican corn rootworms (insecta: coleoptera: chrysomelidae) and cross-amplification with other diabrotica spp. | the northern corn rootworm (diabrotica barberi) and mexican corn rootworm (diabrotica virgifera zeae) are significant agricultural pests. for the northern corn rootworm, and to a lesser extent, the mexican corn rootworm, high resolution molecular markers are needed. here we present 14 polymorphic microsatellite loci isolated from libraries constructed using pooled northern and mexican corn rootworm genomic dna. polymorphism in other diabrotica, including the banded cucumber beetle, southern corn ... | 2008 | 21585878 |
| genetic variation in geographical populations of western and mexican corn rootworm. | genetic variation in the nuclear rdna its1 region of western corn rootworm, diabrotica virgifera virgifera (wcr), and mexican corn rootworm, d. v. zeae (mcr) was studied. two sites were detected which differentiated wcr and mcr in the 642-base sequence. polymerase chain reaction-restriction fragment length polymorphism (pcr-rflp) analysis of the first internal transcribed spacer region (its1) sequence revealed no variation within or among the twelve wcr and two mcr populations. pcr-rflp of 75% o ... | 1999 | 10620046 |
| the role of wolbachia bacteria in reproductive incompatibilities and hybrid zones of diabrotica beetles and gryllus crickets. | a rickettsial bacterium in the genus wolbachia is the cause of a unidirectional reproductive incompatibility observed between two major beetle pests of maize, the western corn rootworm, diabrotica virgifera virgifera, and the mexican corn rootworm, d. v. zeae. these subspecies are allopatric except for two known regions of sympatry in texas and mexico. we demonstrate that populations of d. v. virgifera, with the exception of two populations in southern arizona, are infected with a strain of wolb ... | 1997 | 9326628 |
| evaluation of corn hybrids expressing cry1f, cry1a.105, cry2ab2, cry34ab1/cry35ab1, and cry3bb1 against southern united states insect pests. | studies were conducted across the southern united states to characterize the efficacy of multiple bacillus thuringiensis (bt) events in a field corn, zea mays l., hybrid for control of common lepidopteran and coleopteran pests. cry1f protein in event tc1507 and cry1a.105 + cry2ab2 proteins in event mon 89034 were evaluated against pests infesting corn on above-ground plant tissue including foliage, stalks, and ears. cry34ab1/cry35ab1 proteins in event das-59122-7 and cry3bb1 in event mon 88017 w ... | 2012 | 23156183 |
| population patterns of mexican corn rootworm (coleoptera: chrysomelidae) adults indicated by different sampling methods. | the mexican corn rootworm, diabrotica virgifera zeae krysan & smith, is a serious pest of corn, zea mays l., in several areas of texas. recent demonstrations of areawide adult control suggest this tactic has promise for rootworm management, but additional information regarding treatment thresholds and sampling methodology is needed. in 2000 and 2001 we examined the influence of distance into the field on rootworm captures by crw and pherocon am traps, the fidelity of trap captures to population ... | 2004 | 15154499 |
| response ofdiabrotica virgifera virgifera, d. v. zeae, andd. porracea to stereoisomers of 8-methyl-2-decyl propanoate. | the four stereoisomers of 8-methyl-2-decyl propanoate were tested in the united states and mexico for attractiveness todiabrotica virgifera virgifera leconte, the western corn rootworm,d. v. zeae krysan and smith, the mexican corn rootworm, andd. porracea harold. males ofd. v. virgifera andd. v. zeae responded strongly to the (2r,8r)-isomer and secondarily to (2s,8r), whiled. ponacea responded exclusively to the (2s,8r)-isomer. the (2s,8s)- and (2r,8s)-isomers were inactive in all tests. synergi ... | 1984 | 24318854 |
| identification of a female-produced sex pheromone of the western corn rootworm. | a sex pheromone has been isolated and identified from virgin females of the western corn rootworm (wcr),diabrotica virgifera virgifera leconte. the synthesized compound, racemic 8-methyl-2-decanol propanoate, was equal in attraction to the natural pheromone when tested in the field as a trap bait against three taxa ofdiabrotica known to respond to pheromone extracts from female wcr. five taxa (d. virgifera virgifera; d. virgifera zeae krysan and smith, mexican corn rootworm;d. longicornis barber ... | 1982 | 24414965 |