【摘要】 1.警纹地老虎在新疆各地与黄地老虎同时混合发生,各虫态又与黄地老虎相近似,因而两种地老虎常常混淆不清,给研究和测报工作带来一定的困难。本文对它与黄地老虎的形态做了比较,生物学特性作了叙述。 2.此虫在南疆莎车地区一年发生二代,以滞育的第二代幼虫在土中越冬。越冬深度较黄地老虎为浅。成虫发生期为4月中旬至9月中旬,其间出现两次高峰,第一次为4月下旬至5月上旬,第二次为7月上中旬。 3.警纹地老虎虽是杂食性害虫,但其寄主植物范围较黄地老虎为狭。第一代幼虫一般生活在藜科杂草上,作物地除苜蓿外很少发现它的踪迹:第二代主要集中苜蓿、甜菜和马铃薯等作物为害。 4.各虫态历期长短随温度而异。卵期当温度为20℃及26℃时,分别为8-10天、4-6天;蛹期在17-18℃及25-27℃时,分别为25-28天、12-14天;幼虫期第—代以灰藜、甜菜、玉米饲养者,分别为26-33天、33天、37-38天。 5.成虫取食马蔺花蜜者产卵量较取食白菜花及清水者高1.29、2.26倍。幼虫取食甜菜者其成虫产卵量较取食玉米者高1.74倍,蛹重以取食灰藜和甜菜者较重,取食马铃薯和玉米者较轻。更多还原

【Abstract】 Euxoa exclamationis (L.) which is often found mixed with Agrotis segetum (Schiff.)in the field is a serious pest of farm crops in Sinkiang region. The morphological characteristics (in comparison with Agrotis segetum), life historyand habits of this pest are described in the paper according to the results of investiga-tions made during the past few years. In Shache District, southern part of Sinkiang,there are 2 generations a year, the mature larvae of second generation of this insect hiber-nate in later fall just below the surface of the soil. The first generation larva attacks Chenopodiaceous plants only and that of the secondinjures alfalfa, sugar beet and potato seriously. The moths occur from mid-April to mid-September, and most prevalent in late April and July. Various food plants were tested to the moths and larvae to see their influence on thenumber of eggs laid by the moths. The results show that the moths laid more eggs(1.3--2.2 times) when feeding on flower of Iris than on Chinese cabbage or plain water.It also shows that when larvae fed on sugar beet, the moths emerged from the pupaeof such larvae laid 1.7 times more eggs than those from the larvae fed on corn. More-over, the body weights of the pupae reared from the larvae fed on sugar beet or Cheno-podium are heavier than those on potato or corn, according to the result of another test.It is concluded that the plants belonging to the Chenopodiaceae have favourable affect onthe vitality of this insect.更多还原