engleski

Results of 5-years investigations of corn hybrids tolerance to Western Corn Rootworm larval feeding

Investigations of corn tolerance to larval feeding were conducted in Croatia continuously through five years. A great number of Croatian commercial hybrids and Pioneer hybrids, as a standards for tolerance and susceptibility, were evaluated for corn tolerance by measuring root damage, root size and root regrowth. Here are abstracted seven Croatian hybrids which were present throughtout all five years at Osijek locality. Hybrids were in field trials in four replicates. Root injury was rated by using Iowa Node Injury Scale (0-3), and the hybrid tolerance to larval feeding was compared by evaluated root size and root regrowth. The Eiben 1-6 Scale, reversed, (Rogers 1975) was used to rate root size and regrowth. On the reversed scales a rating of 1 indicated a large root system or well developed secondary roots, and a rating of 6 indicated a small root system or poorly developed secondary roots. Results showed significant increase of root damage in 2003 (1, 67), 2004 (1, 25) and 2005 (1, 36) in compare to 2001 (0, 07) and 2002 (0, 10). Root size and root regrowth also differ significantly in years of investigations, while differences between hybrids occurred just in analyses of root regrowth. According to the root regrowth scale, hybrid OSSK 617 appeared to be the most tolerant through all years of investigation.

WCR ; tolerance maize hybrids

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