欧洲玉米螟赤眼蜂大面积防治甘蔗螟虫效果

欧洲玉米螟赤眼蜂1983年引自美国,经多年观察研究,该蜂具有易繁殖、耐高温、雌性比高等优点。自1986年3月中旬至6月底,在广东省番禺县800亩蔗田放蜂9批,累计每亩放蜂量5.5万头,其寄生效果显著高于本地优势种拟澳洲赤眼蜂。

INUNDATIVE RELEASE OF TRICHOGRAMMA NUBILALE ERTLE & DAVIS TO CONTROL SUGARCANE BORERS IN LARGE AREAS

Trichogramma nubilale was introduced from USA to Guangdong in 1983. Pour years of studies on its biology and ecology showed that the species has such advantageous characteristics as easy to mass produce, more tolerant to high temperature and has higher ratio of females in its progeny than other indigenous species of Trichogramma. Following positive experimental results from small plots in 1983, mass reared T. nubilale was released in 800 mus of sugarcane fields in Pan-yu County, Guang-dong Province to control sugarcane borers (Chilo sacchariphagus. and Argyroploce sehistaceana). Nine releases, totalling 55,000 parasites per mu, were made during mid-March to June, 1986. Compared with releasing Trichogramma: confusum, the dominant native species, T. nubilale gave a better control, with sustained population in the sugarcane fields. The released T. nubilale was also more vigorous than T. confusum. especially during hot summer seasons.