Abstract. The reproductive biology, and larval and adult host range of Diabrotica speciosa (Germar), Diabrotica viridula (F.), Acalymma spp. (Coleoptera: Chrys. Diabrotica viridula. Alexander Derunkov. rootworm beetle. Diabrotica viridula. Alexander Derunkov. rootworm beetle. Diabrotica viridula. Alexander Derunkov. FAMILIA CHRYSOMELIDAE Latreille, SUBFAMILIA GALERUCINAE Latreille, TRIBU Luperini Gistel, Diabrotica viridula Fabricius.
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Potato plants were tested in ml containers, to accommodate the germinated tubers.
They hide in diabrtoica crown or rosettes of winter-growing plants. The eggs of D. However, because not all the hosts were present at each collection site, the average proportions do not necessarily sum 1.
The indirect density measure used to determine the favorite adult hosts of the different Diabroticites studied is far from precise, because different hosts allow different possibilities of finding and capturing the beetles e. Maize was considered the control host for Diabrotica spp.
A minimum of five replications were tried for each species on each putative host.
The larvae were incubated on seedlings and sprouted tubers in the case of potatoes, C. The timing diwbrotica sowing the eggs was viridulaa on the host plant.
MfN, lectotype, male, verified. However, drastic beetle density differences normally observed when two or more of the hosts were found in the same site compensate for these imprecisions, in that rarely were the densities observed close enough as to pose any doubts as to which plant species had more beetles feeding on it.
A shift to soya as an ovipositing host has been observed in D. Development time is longer and more irregular, and percent emergence lower, showing a general impaired development on this crop. So the adult feeding hosts of D. Biological traits universal for the North American species of the virgifera group were not found in the species of that group which we studied, D. Articles with ‘species’ microformats.
In their work on the northern hemisphere species of Diabrotica belonging to the virgifera group, Branson and Krysan suggested that univoltinism and diapausing eggs responded to their adaptation to a few annual grasses, taking specialization as the way to not have to deal with many different toxins, as the generalist fucata group larvae would. No larval survival was observed on the Dicotyledonae tested. The impact of corn rootworm protected biotechnology traits in the United States.
The cucurbit beetle is cold-tolerant and overwinters as an adult. Larvae diabrotoca in late May or early June and begin to feed on corn roots. The pupal stage is white and has the viridulx shape of the adult.
Diabrotica viridula Fabricius
Corn rootworms are one of the most economically significant consumers of maize in the United States. Neither all the plant species, viridulx all the beetle species could be tested at the same time for reasons of space, egg or host plant availability. Laboratory test on host breadth of Acalymma and Diabrotica spp. This pattern held during fall, although alfalfa and soybeans were regularly found to host a large proportion of beetles as well. The sole South American species of this group considered a pest is Diabrotica viridula F.
Feed mainly on vegetables, but are particularly associated with Cucurbitaceae.
Reinvestigation of host location by western corn rootworm larvae Coleoptera: Diabrotica speciosaDiabrotica viridulaAcalymma spphost rangehost shifts.
Views Read Edit View history. This page was last edited on 22 Marchat Wild and cultured cucurbits, grain crops, pasture crops, and wild species that are common hosts of adult Diabroticites, were sampled from the year to the yearto verify larval hosts in the wild. In the same laboratory conditions, D. Ministerio da Agricultura, Depto. The beetles used for observations, and to establish laboratory colonies were collected with sweep nets, funnels, and aspirators on at least 20 cultivated and wild host plants: When any chrysomelid larvae were found, they were placed in a maize seedling culture, and transported to the laboratory for identification.
It suggests that we face a taxon of insects whose adaptability to new and unfavorable conditions challenges our capacity to predict host crop and geographical range shifts, as well as our chances to provide new management techniques. Merrill roots, and not so well on pumpkin Cucurbita maxima Duchesne and Cucurbita andreana Naudinbeans Phaseolus spp.
rootworm beetle, Diabrotica viridula (Coleoptera: Chrysomelidae) –
View large Download slide. An extreme case of different feeding to oviposition host was observed in D. Monitoring of western corn rootworm Diabrotica virgifera virgifera LeConte in Europe The other virgifera group species studied, D. Diabrotica Scientific classification Kingdom: Of these, the genus Diabrotica Chevrolat includes the greatest number of pest species, including some of the most important row crop and vegetable pests of the Americas, be it the foliage, fruit- or flower-feeding adults, or the root-feeding larvae.
Colombia, Ubaque; type depository: However, the lack of egg diapause, makes the population levels of South American pest Diabroticites diabrltica a given season wholly dependent on the presence of adult females, and the survival of the recent egg bank.
Moist cloth squares alone were also offered, and considered second controls to compare with the rejected, or nonpreferred, putative hosts. This unspecific behavior, would dlabrotica compensated by the narrow oviposition host range observed so far in the species of the virgifera group Branson and Krysana trait of unquestionable adaptive utility in a natural environment, where adequate hosts may grow disseminated.
Northern corn diqbrotica beetles are solid in color and vary from light tan to pale green. Chrysomelidaeciabrotica central Mexico.
Email alerts New issue alert. Host plant breadth and importance of cu-curbitacins for the larvae of Diabroticites Galerucinae: Chrysomelidaetwo species of South American pest rootworms. The evidence of unspecific host selection by the larvae, sudden switch to new hosts, as D. This, however, would agree with the more northerly known distribution of the species.