engleski

BT corn in controling ECB in Croatia

In Croatia corn is grown on approximately 350.000 ha and ECB is one of the permanent corn pests. Attack intensity was 58% in the period 1995-1999. Its control has practically not been carried out. In 1998 and 1999 Bt corn hybrids of selection firm Pioneer were subjected to the investigation carried out on several localities in Eastern part of Croatia. Hybrids Landia Bt, Evelina Bt, Clarica Bt were under study and compared to the same hybrids without built-in gene. In the maturity stage period corn dissection was carried out aiming at determination of ECB attack intensity, number of tunnels and caterpillars per plant, stem damage length and obtained yield. In 1998 ECB attack intensity with Landia hybrid amounted to 98%, Landia Bt 21%, and Evelina 51% whereas Evelina Bt was not attacked by ECB. In 1999 hybrids Evelina and Clarica were investigated on two localities. Average ECB attack with Evelina was 87% , Evelina Bt 11%, Clarica 89% and Clarica Bt 7%. Hybrid Landia had 5 tunnels and 1 caterpillar per plant wheres stem damage length was 21 cm. Only 0.25 tunnels and 0.04 caterpillar per plant were determined with hybrid Landia Bt whereas stem damage was 0.45 cm. Average stem damage on hybrid Evelina was 3 cm with two tunnels and 0.42 caterpillar in 1999. As for hybrid Evelina Bt, the stem damage amounted to 0.29 in length, with 0.93 tunnels and 0.012 caterpillar. Hybrid Clarica with average ECB attack of 89%, per stem had 2 tunnels and 0.52 caterpillar whereas damage length was 6 cm. Clarica Bt had attack intensity of 7%, 0.73 tunnels and 0.008 caterpillar per plant whereas damage stem amounted to 0.23 cm. Corn kernel yield with Eveline Bt and Landie Bt was higher whereas with Clarica Bt it was lower by 36 kg/ha compared to standard hybrids. Bt corn hybrid use showed attack intensity decrease of ECB and other plant damage parameters. In our country there are no legal regulations of transgenic plants use since many organizations are against transgenic plants spreading.

Ostrinia nubilalis Hüubner; GMO; intensity of attack ECB

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