Naslov
Emergence and the optimum time for scouting of Western Corn Rootworm based on ovarian development and accumulated degree-days.
(Emergence and the optimum time for scouting of Western Corn Rootworm based on ovarian)

Autori
D. Dzoic, M. Ivezic, E. Raspudic, M. Brmez, I. Majic, J.J. Tollefson

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

Izvornik
IWGO International Working group on Ostrinia and other maize pests 23rd IWGO Conferenc & 2nd International Conference of Diabrotica Genetics / Kuhlmann, Urlich ; Edwards, Richard ; Wang, Zhen-ying - : IWGO, 2009, -----

Skup
23rd IWGO Conferenc & 2nd International Conference of Diabrotica Genetics

Mjesto i datum
München, Njemačka, 05.04.2009. - 08.04.2009

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Diabrotica virgifera virgifera ; degree-days

Sažetak
WCR (Diabrotica virgifera virgifera) is the most important perennial pest of maize in Croatia. The primary control measure is crop rotation, but it is necessary to incorporate alternative tactics. The objectives of this investigation were to develop model to predict beetle emergence, based on accumulated degree- days for air temperature, and to determine optimum time for scouting based on ovarian development of the gravid females. The research was conducted in 2005 in Slavonija County, Croatia. Cages and pheromone traps were placed in the field in order to estimate the first day of beetle emergence (biofix). Estimation of emergence was based on degree-days for air temperature post biofix. Ovarian development was determined by dissection of the gravid females and optimum time for scouting was determined upon degree-days post biofix. The average of accumulated degree-days was 5, 5°C per a day. More than 50% of the total number of the adult WCR was recorded at the sum of 221 degree-days post biofix, while the total number of the adult population appeared at the sum of 393 degree-days. The first gravid females were detected at 30 degree-days, 50% appeared at 235 degree days. The gravid females were present in the field until 360 degree-days post biofix. Based on the dissection of gravid females, 10% of the females had the full gravidity (III. and IV. ovary stages) at 121 degree-days post biofix. The scouting of the WCR beetles should be between 121 and 360 degree-days, and the optimum is 221-235 degree days post biofix.

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija)

POVEZANOST RADA