Naslov
Western Corn Rootworm and the European Crop Rotation System : Adaptation or Egg Laying by Chance?

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

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

Izvornik
Abstracts of the International Symposium "Ecology and Management of Western Corn Rootworm" / - , 2003, 31-31

Skup
Ecology and Management of Western Corn Rootworm. International Symposium

Mjesto i datum
Göttingen, Njemačka, 19.01.2003. - 23.01.2003

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
western corn rootworm; crop rotation system

Sažetak
The focus of this study was to 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 duplicated within the framework of the FAO WCR Network in Croatia and the Federal Republic of Yugoslavia (FRY) in 2001 and 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 cor 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 (field A), while the other consisted of 6 replications each of a cereal, sunflower, soybean, and corn (field B). 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 mid September. In addition, soil samples and corn roots were taken from each plot to determine WCR egg and larval populations. The presentation will include a discussion on numbers of WCR adults caught 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 in 2001. WCR adults were observed in non-corn plant stands though in significantly lower numbers when compared to corn. Based on the study, there is a potential for WCR female egg laying in non-corn plant stands. Study site observations of volunteer winter wheat showed that these plants were attractive as a feeding site for adult WCR. In Hungary, eggs were found only in soil where corn was planted, but numbers were extremely 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 non-corn precrops confirmed larval presence though in significantly less numbers compared to that of corn after corn. In addition to larval sampling, emergence of WCR adults in corn after oat, soybean, and sunflower were determined using emergence cages. In the study sites, 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.

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija)

POVEZANOST RADA