问题 问答题 论述题

田间发现玉米幼苗靠近地表的茎部被害虫咬断,断口整齐平滑。仔细检查被害株根部土壤,发现此害虫体表暗褐色,粗糙并密布大小颗粒,臀板黄褐色中央有对称的两条深褐色纵带,则此害虫属于何类害虫?如何对该害虫进行防治?

答案

参考答案:

此虫为地老虎。防治该虫的方法有:

①撒施毒土或毒沙。50%甲胺磷乳油以1:1000的比例制成毒土或毒沙,每667m撒施20~25Kg。

②毒饵诱杀。将50%辛硫磷乳油500ml加水2.5~5.0kg,拌碎鲜草或菜叶(如灰菜、刺儿菜、苦荬菜、苜蓿等)30~50kg,用量15kg/667m,将毒草于傍晚撒到作物幼苗根际。

③药液灌根。50%辛硫磷乳油每公顷3.75~5Kg,兑水6000~7500Kg灌根。

④药剂拌种,用50%甲胺磷乳油按药:水:种子=1.4:5~7:100的比例于玉米种子混拌均匀。

⑤喷雾防治3龄前幼虫。2.5%溴氰菊酯乳油3000倍液喷雾。

⑥农业防治:早春铲除地头﹑地边杂草,春耕多耙。

单项选择题 A1/A2型题
填空题

Holidays are special times of (1) from work and other routines. Holidays are often times for celebration, (2) , eating, drinking, travel, and family (3) . In most cultures the scheduling of holidays originally was related to the (4) , the (5) cycle, and (6) . Christmas, December 25, celebrates the (7) of Jesus, but it is not actually known whether Jesus was (8) in the wintertime Over the years Christmas has come to symbolize goodwill and (9) for both Christians and non-Christians, and the (10) of Christmas threatens to replace generosity with greed. Other important holidays in America are Valentine’s Day, St. Patrick’s Day, April Fools’ Day, and (11) . On Valentine’s Day, people give cards, chocolates, flowers, and kisses to their (12) and sweethearts. During Easter Week in late March or early April, Christians remember the death and (13) of Jesus. Although not actually a holiday and has no religious (14) , April Fools’ Day, celebrated on April 1, is a day when people play embarrassing (15) on their fiends and (16) and even on their teachers. In (17) , Labor Day is celebrated on May 1, whereas in (18) and the United States, labor and laborers are honored by a (19) holiday on the first (20) in September.

Holidays are special times of (1) from work and other routines. Holidays are often times for celebration, (2) , eating, drinking, travel, and family (3) . In most cultures the scheduling of holidays originally was related to the (4) , the (5) cycle, and (6) . Christmas, December 25, celebrates the (7) of Jesus, but it is not actually known whether Jesus was (8) in the wintertime Over the years Christmas has come to symbolize goodwill and (9) for both Christians and non-Christians, and the (10) of Christmas threatens to replace generosity with greed. Other important holidays in America are Valentine’s Day, St. Patrick’s Day, April Fools’ Day, and (11) . On Valentine’s Day, people give cards, chocolates, flowers, and kisses to their (12) and sweethearts. During Easter Week in late March or early April, Christians remember the death and (13) of Jesus. Although not actually a holiday and has no religious (14) , April Fools’ Day, celebrated on April 1, is a day when people play embarrassing (15) on their fiends and (16) and even on their teachers. In (17) , Labor Day is celebrated on May 1, whereas in (18) and the United States, labor and laborers are honored by a (19) holiday on the first (20) in September.