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一、引言 百色在广西丘陵区与云南高原的交接地带,是右江河流两岸的典型低洼盆地(海拔自110—130米)。这个地区,一年内种早、晚两造玉米(有的也种一造中玉米),早玉米多在2月上旬至3月下旬播种,晚玉米7月上旬至8月下旬种植。玉米螟为害比海拔高的土石山区(海拔500—900米)和高寒山区(海拔1200—1500米)严重,晚玉米重于早玉米,早玉米常年被害株率在20—60％左右,晚玉米在40—95％,损失很大。 右江盆地玉米螟一年发生6个完整世代(个别有7代)。越冬代蛾出现在3月中旬至4月下旬,一代蛾在5月上旬至下旬,二代蛾在6月中旬至7月上旬,三代蛾在7月中旬至8月上旬,4代蛾在8月中旬至9月中旬,5代蛾在10月上旬至下旬,6代蛾(少数)在11月上旬至中旬。绝大部分以第6代幼虫在玉米、高粱、小米秆内越冬。 群众对王米不同播种期与玉米螟的为害关系说法不同:有的说提早播种能减轻受害;有的说推迟播种螟害轻。为了探索这个问题,我们于1962—1963年进行了考察,现将结果简报于下。
I. INTRODUCTION Baise is a typical low-lying basin on both sides of the Youjiang River (110-130 meters above sea level) at the junction of Guangxi Hilly and Yunnan Plateau. In this area, early corn and late corn are planted in one year (some are also planted with maize). Early maize is planted from early February to late March and late corn is planted from early July to late August. Ostrinia furnacalis damage than the high altitude of rock and mountain area (500-900 meters above sea level) and alpine mountain (1200-1500 meters above sea level) serious, late corn is heavier than early corn, early corn perennial plant damage rate of 20-60%, late corn In 40-95%, a great loss. Corn borer in the Youjiang Basin occurs six complete generations a year (7 generations each). Overwintering moth occurs in mid-March to late April, a generation of moths in early May to late, the second generation moths from mid June to early July, the third generation of moths in mid-July to early August, fourth-generation moths in 8 From mid-month to mid-September, 5th-generation moths are from early October to late October, and sixth-generation moths (minorities) are from early to mid-November. Most of the 6th generation larvae overwinter in corn, sorghum, millet straw. Some people said that the damage caused by the sowing of corn at different sowing dates was different: some said that early sowing could reduce the damage; In order to explore this issue, we conducted a survey in 1962-1963 and present the results in brief.