Naslov
New Development of WCR in Croatia

Autori
Igrc Barčić, Jasminka ; Dobrinčić (Bažok), Renata ; Maceljski, Milan

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

Izvornik
IWGO Newsletter of the 5^th FAO/TCP Meeting, 6^th EPPO ad hoc Panel, 7^th International IWGO-Workshop / - Stuttgart, 2000

Skup
Western Corn Roootworm Diabrotica virgifera virgifera LeConte. 5^th FAO/TCP Meeting. 6^th EPPO ad hoc Panel. 7^th International IWGO-Workshop

Mjesto i datum
Stuttgart, Njemačka, 16.11.2000. - 17.11.2000

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
western corn rootworm; development; Croatia

Sažetak
As in the previous years the Department for Agricultural Zoology, Faculty of Agriculture, Zagreb has carried out the monitoring of the WCR in Croatia in 2000. The traps were placed on 133 sites. On each site one pheromon and one yellow trap (Pherocon or Multigard) were placed at least 100 m apart. Traps were placed in the field on June 20^th. Traps were replaced by fresh ones each 25 days. Each 7 days traps were checked and beetles collected. 60% of sites (80 sites) were situated in perviously infested areas and 40% of sites (53 sites) in areas which were not infested in 1999. The results of monitoring the WCR in the period 1995-2000 are summarised in the table. The first beetle was found in soil on June 14^th. The first beetle was caught on traps on June 20^th, the same day when the traps were placed in the field. The appearance of the beetles was 10-14 days earlier than in previous years. This fact can be explained with extremly dry and hot weather conditions in May and June. The maximum catch was registered between July 10^th and 20^th what is also earlier than in previous years. The spread of the WCR in the direction to the west was registered in northen and middle part of the infested area. In the northen part of the infested area WCR spread 35 km to the west. In the middle part of the infested area WCR spread about 20 km to the west, and in the southern part of the infested area no further spread was registered. The spread of WCR in 2000 was faster along the river Drava than along the river Sava, similar to the situation in the last year. The farthest point of the WCR spread toward northwest is about 40 km from Slovenia. At this moment the total area of 145 000 sq km is infested on which area 200.000 ha of corn is grown. The spread of the WCR in Croatia is shown in the map. The estimated population grown index is about 2, 5. In our insecticide trials conducted at a site on the border with Yugoslavia, the mean root damage rate in untreated plots was between 3 and 3, 5 (Iowa State University scale). The mean root damage rate in 1999 was between 2, 5 and 3. On some plants minor goose neck symptoms appeared. The yield loses due to root damages in this trials were 5-25%. On one field in the region infested in 1997 on 10% of plants serious root damages. The investigation of biology and ecology of the WCR have been carried out for 4 years in zhe field and in the laboratory conditions also. The results presented in this summary are preliminary, as only about 70% of data were collected at the moment of its submission.

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija)

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