engleski

Correlation between plant lodging caused by Western Corn Rootworm and grain yield

Western Corn Rootworm (WCR) (Diabrotica virgifera vigifera LeConte) occurred in Croatia in 1995, and since than progressively increased in population. Many cornfields had great percentages of lodged plants which caused economic losses. The aim of this investigation was to determine correlation between plant lodging caused by WCR and grain yield. Field trials were settled in Osijek area in 2005. Investigation was done on twelve Croatian commercial hybrids, in four replicates. 25 plants in each replicates were ratified in five categories of lodging according to lodging angle: (1- lodging angle 0o ; 2 – lodging angle 1-15o ; 3 – lodging angle 16-30o ; 4 - lodging angle 31-45o ; 5 – lodging angle >45o). Grain yield was estimate by weighting of corn cobs for each plant separately. Correlation between grain yield and plant lodging was done as well as correlation of lodged plants and ratings of root damage according to Iowa Node Injury Scale (0-3). Results showed that there were no statistically significant differences between correlation of grain yield and plant lodging although plants with no lodging had the greatest values of grain yield. Nevertheless, linear trend decreased in line with larger lodging angle. The results also showed strong negative correlation (r = -0, 480**) between plants lodged over 45 degree angle and root damage ratings. That indicates how root damage ratings done earlier in the vegetation period (in the beginning of July) could serve as reliable parameter for determination of plant lodging.

Western Corn Rootworm ; plant lodging ; grain yield

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