Naslov
Western Corn Rootworm (Diabrotica virgifera virgifera LeCinte) and the European Crop Rotation System: Results of a Regional Trial

Autori
Kiss, Jozsef ; Khosbayar, Bayar ; Komaromi, Judit ; Igrc Barčić, Jasminka ; Dobrinčić, Renata ; Sivčev, Ivan ; Edwards, C. Richard ; Rosca, Ioan ; Hatala-Zseller, Ibolya

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
IWGO Newsletter of the 9th IWGO Diabrotica Subgroup Meeting and 8th EPPO Panel / - Beograd, 2002

Skup
9th IWGO Diabrotica Subgroup Meeting & 8th EPPO Panel

Mjesto i datum
Beograd, Jugoslavija, 03.11.2002. - 05.11.2002

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
western corn rootworm; European crop rotation system

Sažetak
The focus of this study was determine if WCR adults over the population buildup period in Europe can be attracted to crops grown in rotation with corn for egg laying. A crop rotation trial was established in 2000 in Szeged in Southern Hungary (EU-5 project). This study was extended within the framework of the FAO WCR Network in Croatia, in the Federal Republic of Yugoslavia (FRY) in 2001 and in Romania in 2002. This allowed for comparisons among four different regions within Central Europe (Szeged, Hungary ; Tovarnik, Croatia ; Dobanovci, FRY ; and Jimbolia, Romania). The crops rotated with corn were corn (therefore, continuous corn), sunflower, soybean, and a cereal (winter wheat, oat, or spring barley). Corn was grown on trial fields in previous years. The study field was divided into two sections. One section consisted of corn, while the other consisted of 6 replications each of a cereal, sunflower, soybean, and corn. The year after, these two sections were rotated so that the rotated crops in one section were followed by corn and the corn section by the rotated crops. The presence of WCR was assessed and quantified by using Pherocon AM traps and emergence cages (3 each per plot) from mid June to early-mid September. In addition, soil samples and corn roots were taken from each plot to determine WCR egg and larval populations. This presentation will include a discussion on numbers of WCR adults cauhgt on Pherocon AM traps in non-corn plant stands, larval presence (soil and corn root samples), and adult emergence (emergence cages) in the following year´s corn. WCR adult populations in continuous corn were at economic treshold levels in the study regions. WCR adults were trapped by Pherocon AM traps in non-corn plant stands (winter wheat or barley, sunflower and soybean) in Hungary and Croatia, though in significantly lower numbers when compared to corn. Beside corn plots, few WCR adults were trapped in soybean only in F.R. Yugoslavia, though WCR population in continuous corn increased there by 4 times. Study site observations of sunflower (flowers and polen) and volunteer winter wheat showed that these plants were attractive as a feeding site for adult WCR in Hungary. Based on the study, there is a potential for WCR female egg laying in non-corn plant stands. In Hungary, eggs were found only in soil where corn was planted, but numbers were extremly low. Similar samplings in Croatia and FRY confirmed that WCR eggs were difficult to find. Egg laying by females may be too heterogeneous in distribution over a field, thus sampling methods from the USA could have too large a bias and not appropiate for following WCR populations at the present infestation levels in the research plots in Europe. Larval sampling in June and July in corn after all non-corn pre-crops confirmed larval presence though in significantly less numbers compared to that of corn after corn in Hungary. In addition to larval sampling, WCR adults were trapped under emergence cages in corn after cereals, soybean and sunflower both in Hungary and Croatia. In the study sites in Hungary and Croatia, it was determined that WCR females have the ability to lay eggs in rotated crops, although presently at low levels, and some larval feeding was noted in the following year´s corn. In F.R.Yugoslavia, there were no WCR in emergence cages in corn after non-corn pre-crops.

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija)

POVEZANOST RADA