Occurrence of major field crop pests in Backa in 2007 and forecast for 2008

Abstract

The occurrence and forecasting of the major field crops pests in Vojvodina Province (particularly Backa) has been regularly reported since 1978. By inspection of soil samples from the fields where cereals and sugar beet were grown in 2007, the following average number of insects/m2 was recorded: 2.2 wireworms (Elateridae), 1.5 white grubs (Scarabaeidae), 0.1 caterpillars of Agrotis spp., 0.0 adults of Zabrus tenebrioides, 0.0 adults of Bothynoderes punctiventris and 0.1 chrysalides of Mamestra spp. In late autumn, 10.2 adults/m2 of senn pest (Eurygaster and Aelia), was found on overwintering site Fruska Gora. The number of Cotton bollworm (Helicoverpa armigera) increased in 2007, with significant injuries on tobacco, paprika, tomato, second-crop corn and sunflower in some localities. The number and injuries of ECB (Ostrinia nubilalis) were significantly lower to previous year, while the population density of the WCR (Diabrotica virgifera virgifera) was slightly higher. The major problems in small grain production were aphids, while rodents' populations decreased.

Tokom vegetacije 2007. godine, na području Bačke, konstatovana je slaba pojava i intenzitet napada higrofilnih štetočina biljaka, a značajnija pojava kserotermofilnih vrsta. Pregledom zemljišnih uzoraka u jesenjem periodu, utvrđeno je odsustvo žitnog bauljara i repine pipe, vrlo niska gustina podgrizajućih i lisnih sovica, a umeren rast brojnosti larvi skočibuba, grčica i žitnih stenica.