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  armyworm
Molecular characterization and developmental expression of the gene encoding the prothoracicotropic hormone in the beet armyworm
      
The cDNA encoding PTTH was isolated and sequenced from the beet armyworm, Spodoptera exigua (Spe).
      
Effects of DIMBOA on impulse discharges of maxillary lateral sensillum styloconicum of armyworm larvae
      
The formulas established are found to be rather satisfactory, which add a new approach to the simulation prediction of the armyworm.
      
Sycanus indagator (St?l), a reduviid predator imported from India, preferred greater wax moth larvae (Galleria mellonella (L.)), to larvae of the fall armyworm (Spodoptera frugiperda (J.
      
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Studies on the effect of microclimate of the wheat fields on the populationdensity of the armyworm,Pseudalstia seperata(Walker),were made in 1959.Itwas found that the population density of the armyworm was affected by therelative humidity and the speed of larval development was influenced by thetemperature of the wheat fields.The microelimate of the wheat fields varied withthe rate of planting and the growth conditions of the crop.Relative humiditywas found to be higher when the growth of wheat was...

Studies on the effect of microclimate of the wheat fields on the populationdensity of the armyworm,Pseudalstia seperata(Walker),were made in 1959.Itwas found that the population density of the armyworm was affected by therelative humidity and the speed of larval development was influenced by thetemperature of the wheat fields.The microelimate of the wheat fields varied withthe rate of planting and the growth conditions of the crop.Relative humiditywas found to be higher when the growth of wheat was more luxuriant,whiletemperature was higher when vegetation was thinner.It is pointed out that theeffect of the changes of mieroclimate of the wheat fields on the population fluctua-tions of the armyworm following various changes of cultural practices shouldreceive more attention in the future.

麦田小气候因子对粘虫的发生有一定影响。栽培技术及小麦生长情况不同农田小气候特点各有不同,因而影响粘虫发生数量及发育进度的变化很大;禾苗生长愈茂密,小气候相对湿度愈高,温度愈低。此种条件下,粘虫发生数量较大而发育进度较慢。杂草丛生的农田粘虫发生即多,被害严重,这可能也是受小气候因子的影响所致。预测预报时应注意这些规律。

The oriental armyworm is the most destructive pest of cereal crops in Kirin Pro-vince, Northeast China. The present paper reports on the results of studies on the lifehistory of the said insect in the past ten years (1953--1962), with the hope of findingout the possible source of adult moths of the early spring generation. Two possible sources of the early spring adult moths have been suggested, namely:(1) They originated from the emergence of a hibernating stage either as adult, pupa ormature larva from...

The oriental armyworm is the most destructive pest of cereal crops in Kirin Pro-vince, Northeast China. The present paper reports on the results of studies on the lifehistory of the said insect in the past ten years (1953--1962), with the hope of findingout the possible source of adult moths of the early spring generation. Two possible sources of the early spring adult moths have been suggested, namely:(1) They originated from the emergence of a hibernating stage either as adult, pupa ormature larva from local districts; (2) They are new migrants from the hibernatingground or other outbreak area at a great distance outside Kirin Province. It is concluded that most of adult moths of the early spring generation are newmigrants from the south but not from the local districts, and this is based on the follow-ing observations: (1) It is unable to find any sizable number of the hibernating stageof the insect, indeed, not a single individual of any stage in the early spring. The sud-den appearance of enormous numbers of adult moths at such an early date supplies afurther evidence. (2) Various ways of rearing different stages under field conditions inthe late autumn all fail to carry over successfully to the following year. (3) Both fieldand laboratory experiments all indicate that all stages are not cold hardy. The under-cooling points of larva, pupa and adult are found to be --3.2, --7.5 and --5.9℃ res-pectively. By the method of probit analysis the time durations of LD_(50) when exposed to0--2℃ are found to be 12.7, 13.5 and 9.6 days for larva, pupa and adult respectively.

粘虫是吉林省粮食作物的大害虫。本文为作者于1953—1962年研究粘虫的一部分工作,目的在于分析吉林省粘虫发生猖獗世代的虫源问题。我们怀疑春季出现的大量成虫有两种可能来源:(1)本地越冬的成虫、蛹或幼虫;(2)由外地迁入。通过研究分析,所得结果如下: 1.粘虫在吉林省一年完成两个世代。春季发生的第一代是猖獗世代,幼虫为害盛期在6月下旬至7月上旬,其繁殖虫源主要来自5月下旬到6月上半月出现的成虫。 2.粘虫在当地的入冬虫态,有幼虫、蛹及成虫。经过发生地的越冬调查及野外试验,证明粘虫在东北和内蒙地区的自然条件下不论何种虫态,均不能越冬。 3.据粘虫抗寒力测定,在-8℃恒温下,幼虫、蛹、成虫均迅速死亡,在-5℃下最长只能存活3—7小时,在1±1℃下全部死亡的理论时间为成虫19.95天、幼虫44.67天、蛹25.70天。查当地1、2两月旬平均气温最高-9.4℃,最低-16.5℃,田间5厘米深的土温为-12.4—-9.4℃,均超过虫体的死亡低温。 因此,粘虫不可能在吉林省越冬,从而可以推断猖獗世代的虫源,是由外地迁入的。

In the present work about forty antibiotics were tested for their toxicities on the larvae of the great wax moth,Galleria mellonella,the armyworm,Leucania separata,the cotton bollworm,Heliothis armigera,and the green peach aphid,Myzus persicae.It was found that the antibiotics are rather specific in their mortality effects towards different insect species.When mixed in an artificial diet actinomy-ein D,qingfengmycin,blasticidin S,terramycin and kasugamycin caused relatively high mortality rates on Galleria...

In the present work about forty antibiotics were tested for their toxicities on the larvae of the great wax moth,Galleria mellonella,the armyworm,Leucania separata,the cotton bollworm,Heliothis armigera,and the green peach aphid,Myzus persicae.It was found that the antibiotics are rather specific in their mortality effects towards different insect species.When mixed in an artificial diet actinomy-ein D,qingfengmycin,blasticidin S,terramycin and kasugamycin caused relatively high mortality rates on Galleria mellonella.But for the armyworm and the cotton bollworm only blasticidin S was effective when the solution was applied to the corn and cotton leaves respectively,and for Myzus persicae qingfengmycin was better than blasticidin S.The factor causing mortality in different insect species has been tested and discussed.

本工作收集了三十多种抗菌素(其中农用的14种)对蜡螟、粘虫、棉铃虫、桃蚜进行了毒效试验。结果表明同一抗菌素对不同昆虫的效果不同:在蜡螟中以放线菌酮、庆丰霉素、灭瘟素、土霉素、春雷霉素等毒效较高;对于粘虫和棉铃虫,只有灭瘟素效力较好;但在桃蚜中则灭瘟素的效果不及庆丰霉素。对于抗菌素引起昆虫死亡的原因进行了检查和讨论。

 
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