Monitoring of the Western corn rotworm at family farm Josip Lović in 2018

Abstract

Kukuruz je jedna od najvažnijih žitarica u svijetu s mogućnošću raznovrsnog korištenja stoga je važno voditi računa o njegovoj zaštiti od štetnika i bolesti koji mogu umanjiti prinos i kvalitetu. Najvažniji štetnik kukuruza u Hrvatskoj i svijetu je kukuruzna zlatica (Diabrotica virgifera virgifera LeConte), čija ličinka oštećuje korijen kukuruza uslijed čega dolazi do polijeganja biljaka, dok imago oštećuje svilu i list. Kukuruzna zlatica se javlja na usjevu kukuruza ukoliko se ne poštuje plodored kao jedna od najvažnijih mjera borbe. Monitoringom kukuruzne zlatice kod ponovljene sjetve kukuruza u Gorjanima, na OPG-u Josip Lović u 2018. godini pratila se brojnost imaga, ocijenila oštećenost korijena Node Injury Scale 0-3 metodom, veličina korijena i porast sekundarnog korijena skalom 1-6 te odredio postotak polegnutih biljaka. Istraživanjem je utvrđena značajna oštećenost korijena (ocjena 2,20), veliki postotak polegnutih biljaka (10 %), slaba razvijenost korijena (ocjena 3,7), slaba regeneracija sekundarnog korijenja (ocjena 3,65) te velika prisutnost imaga kukuruzne zlatice (maksimum prva dekada srpnja). Rezultati rada pokazuju kako u idućoj godini nije preporučljiva sjetva kukuruza na istoj parceli zbog mogućih ekonomskih gubitaka.The corn is one of the most important cereals in the world with a variety of uses so it is important to take care of pests and diseases that could reduce yield and quality. The most important corn pest in Croatia and in the world is western corn rootworm (Diabrotica virgifera virgifera LeConte). The larva is damage root of corn and causes the lodging of plants while imago damage silk and leaf. The corn rootworm appers in the crop of corn if it is not respected crop rotation like one of the most important measure. Monitoring the state of the corn rootworm in repeated corn sowing in Gorjani, at family farm Josip Lović in 2018 includes follow number of imago, evaluated root damage with Node Injury Scale 0-3, evaluated root size and secondary root rate increase with 1-6 scale and determined the percentage of the plant lodging. Researching was established significant root damage (mark 2,20), the big percentage of the plant lodging (10 %), poor root development (mark 3,7), poor secondary root regrowth (mark 3,65) and big presence imago corn rootworm (maximum in the first decade in July). The results of work show us how in the next year is not advisable to sow corn on the same field because of the potential economic losses