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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Their eggs did not diapause, nor did overwintering adults produce eggs in any way more resistant to cold. In winter, however, a drastic shift was observed, being pigweed, maize silks, leaf vegetables, especially spinach SpinaciaoleraceaL. However, none of these viruses are reported to infect Citrus spp. The diapausing eggs of the North American virgifera pest species, however, result in a virtually permanent egg bank, that makes the population levels of each season less susceptible to weather fluctuations.
Diabrotica speciosa fucata group larvae developed well on maize Zea mays L. In South America, the most common and problematic species is Di-abrotica speciosa Germar.
This pattern held during fall, although alfalfa and soybeans were regularly found to host a large proportion of beetles as well. An extreme case of different feeding to oviposition host was observed in D. Views Read Edit View history. Aedeagus symmetric, with four internal sac sclerites. The evidence of unspecific viridila selection by the larvae, sudden switch to new hosts, as D.
Although the effect of the larvae on the crops they feed on has not been diabrtoica rigorously, there is sound evidence that they viriduls damage maize, potatoes Solanum tuberosum L. New information on the natural history of Diabrotica scutellata Jacoby Chrysomelidae: Another relatively unexplored area of the behavior of Diabroticites is the relationship between oviposition and feeding preferences.
However, other species, as D.
However, all these studies deal with North American Diabroticina, but their extension to South American species is yet to be confirmed. Head basic color yellow or green. In the same laboratory conditions, D. Diabtotica, first instars could not feed on the tubers, only on the roots, although mature larvae could. Together with these methods, polyester cloths sprayed with root or berry extracts of the wild, perennial cucurbits, tayuya Cayaponia spp. The favorite adult hosts of D.
Adults like to feed on pollen-rich flowers such as cucurbits, thistle, and sunflower. Six colonies of D. In other projects Wikimedia Commons Wikispecies.
rootworm beetle, Diabrotica viridula (Coleoptera: Chrysomelidae) –
In winter it was only found on maize silks. EPPO data sheets on quarantine pests Diabrotica speciosa. 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.
Oviposition preferences roughly paralleled larval suitability, but there was a clear preference for cucurbits as adult food, when available; pigweed Amaranthus quitensis Kunthsunflower Helianthus annuus L. Neither all the plant species, nor all the beetle species could be tested at the same time for reasons of space, egg or host plant availability.
The best collections of D. A similar mechanism may have enabled the adoption of potato as a larval host in the Brazilian populations of D.
Larvae have three pairs of legs, but these are not usually visible without magnification. The ability of D. View large Download slide. The proportion of beetles of each species per host was calculated, and averaged for every site per season. Other species showed varying degrees of preference for oviposition and feeding, but in general, cucurbits were the preferred adult feeding hosts, followed by several wild plants, and maize the preferred oviposition host.
According to our caged experiments, this species can develop on potato. Feeding tests confirmed the field observations, as to the favorite adult feeding hosts, and in some cases, the marked difference between feeding and oviposition preferences Tables 2—4.
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. Reinvestigation of host location by western corn rootworm larvae Coleoptera: Maxillary palpi yellow, yellow ocher or amber yellow, labrum black, chestnut or yellow ocher.
Integrated Taxonomic Information System. Radin and Drummondreported that no adjustment could be found to a degree-day model for the striped cucumber beetle in its temperate distribution. Chrysomelidaein central Mexico.
Incidencia de parasitoides e patogenos em adultos de Diabrotica speciosa Germ. Corn rootworms are one of the most economically significant consumers of maize in the United States. Moist cloth squares alone were also offered, and considered second controls to compare with the rejected, or nonpreferred, putative hosts. 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.
Young beetles were provided thin slices of raw squash as fresh food to increase survival.