Overwintering success and weather conditions are the key factors determining the abundance and intensity of the attack of the first generation of European corn borers (ECB). The tolerance of maize to the 1st generation of ECB infestation is often considered to be connected with the maize maturity time. The aims of this research were (I) to examine the reactions of different maize FAO maturity groups in term of the damage caused by ECB larvae, (II) to analyze the influence of four climatic regions of Croatia regarding the damage caused by ECB larvae, and (III) to correlate observed damage between FAO maturity groups and weather conditions. First ECB generation damage has been studied in the two-year field trial with 32 different hybrids divided into four FAO maturity groups (eight per group) located at four locations with different climatic conditions. The results showed a lack of correlation between the FAO maturity group and the percent of damage. The percent of damage was positively correlated with the average air temperature in June (r = 0.59 for 2017 and r = 0.74 in 2018, p = 0.0001) within the range from 20 to 24.5 °C and was negatively correlated with the relative air humidity (r = −0.58 in 2017 and r = −0.77 in 2018, p = 0.0001) within the range of 50% to 80%. Our results provide a better understanding of the different factors that influence ECB damage. The obtained data could be used to predict the damage from the first generation of ECB under the weather conditions of different regions.

中文翻译：

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天气条件和成熟度组对克罗地亚玉米杂交中第一代欧洲玉米Corn侵染的影响

越冬的成功和天气条件是决定第一代欧洲玉米bore（ECB）侵袭的强度和强度的关键因素。玉米对第一代ECB侵染的耐受性通常被认为与玉米成熟时间有关。这项研究的目的是（I）就ECB幼虫造成的损害而言，检查粮农组织不同成熟玉米群体的反应；（II）分析克罗地亚的四个气候区域对ECB幼虫造成的损害的影响， （III）将观察到的粮农组织成熟度组与天气状况之间的损害联系起来。在为期两年的现场试验中，对32种不同的杂种进行了研究，研究了其第一代ECB的危害，这些杂种被分为四个粮农组织成熟度组（每组八个），位于四个气候条件不同的地点。结果表明，粮农组织成熟度组与损害百分比之间没有相关性。伤害百分比与6月的平均气温呈正相关（2017年r = 0.59，2018年r = 0.74，p = 0.0001）在20至24.5°C的范围内，并且与相对空气湿度（2017年r = -0.58和2018年r = -0.77，p = 0.0001）呈负相关，在50％至80％的范围内。我们的结果更好地了解了影响ECB损坏的不同因素。所获得的数据可用于预测不同地区天气条件下第一代欧洲央行的损失。