The relationship between predation ratio (E) and density of O. sauteri adults (P) was described by equation of E=0.5224 P-0.7148, and the relationship between intensity of scrambling competition (I) and the density of O. sauteri adults (P) was I =0.9689logP + 0.0763.

The relationship between predation ratio (E) and density of O. sauteri adults (P) was described by equation of E=0.5224 P-0.7148, and the relationship between intensity of scrambling competition (I) and the density of O. sauteri adults (P) was I =0.9689logP + 0.0763.

The predation of Hippodamia variegata and Leucopis annulipes on the aphid could be well described by Holling II type, with the models as 1/ N a = 1 2550/ N +0 0046 and 1/ N a = 1 3280/ N +0 0071 respectively.

多异瓢虫Hippodamia variegata Goeze成虫和斑腹蝇Leucopisannulipes Zett．3 龄幼虫对麦双尾蚜的功能反应均为II型， 关系式分别为1／ Na ＝ 1－2550／ N＋ 0－0046 和1／ Na ＝ 1－3280／ N＋ 0－0071。

EIPC of natural death were 1.3607 and 1.3554. EIPC of parasitism and disease in growing and harvested banana trunks were 1.1988 and 1.1668. The factor of predation and others was important.

the fitted Holling disc equation was Na=1.1576Nt/(1+0.00348Nt), χ 2 test showed that the theoretical expectation calculated by the fitted Holling disc equation fitted well with the observed value. The predation selectivity experiment revealed that adult C.

Weisong sympherobiid (Sympherobius weisong Yang) discovered in Hangzhou and Ning County in Zheiiang province in recent years is one of the important natural enemies, which preys both on Matsucoccus matsumurae (Kuwana)and Matsucoccus massonianae Y. & H. It has two generations a year, but no winter diapause. The first generation occurs from April to late November. The second generation occurs from late August to June the following year. The time of its occurrence is well synchronized with that of the scale. The...

Weisong sympherobiid (Sympherobius weisong Yang) discovered in Hangzhou and Ning County in Zheiiang province in recent years is one of the important natural enemies, which preys both on Matsucoccus matsumurae (Kuwana)and Matsucoccus massonianae Y. & H. It has two generations a year, but no winter diapause. The first generation occurs from April to late November. The second generation occurs from late August to June the following year. The time of its occurrence is well synchronized with that of the scale. The average amount of predation for an adult is 9 pupae or 276.6 eggs per day. A nymph might consume 2837.1 eggs for life time, and it can also prey on the nymph and adult of the scales. Observations indicated that it might exert an obvious suppression on the population of the scales. Experiments showed that its nymph and adult could be reared with eggs or pupae of the scales, eggs of rice moth, a variety of aphids or diet No. Ⅰ.

The functional response of lady bird(Coccinella septempunctata L.) to prey on cotton aphids(Aphis gosspii G.)was tested in cages.The number of aphids attacked(Na)was calculated as Na=Rn_3-n_4.where, R=aphid rate of population increase;n_3=total number of ahids bing counted on the 3rd day before predation;n_4=surviving after 24 hrs of predation on the 4th day.A functional response roughly fit- ting Holling—2 was obtained(a′=0.77;Th=0.00259).Hassell's mutual interference equation was confirmed(Q=0.487;m=0.6284).It...

The functional response of lady bird(Coccinella septempunctata L.) to prey on cotton aphids(Aphis gosspii G.)was tested in cages.The number of aphids attacked(Na)was calculated as Na=Rn_3-n_4.where, R=aphid rate of population increase;n_3=total number of ahids bing counted on the 3rd day before predation;n_4=surviving after 24 hrs of predation on the 4th day.A functional response roughly fit- ting Holling—2 was obtained(a′=0.77;Th=0.00259).Hassell's mutual interference equation was confirmed(Q=0.487;m=0.6284).It is reasoned that the population of aphids,together with lady birds within an enclosed system would be confirmed to an exponential increase or decrease.

用罩笼方法测定了七星瓢虫成虫捕食棉蚜的功能反应。瓢虫一日捕蚜量(Na)用蚜虫日增长倍数(R)与初始蚜量之乘积减去剩余蚜量求得。瓢虫捕食蚜量的功能反应曲线符合 Holling—Ⅱ型,(a′=0.77;Th=0.00259)。测定了瓢虫干扰常数(m)和寻找常数(Q),(m=0.6284;Q=0.487)。根据功能反应曲线推论,当棉蚜与瓢虫共存于一个封闭系统内时,棉蚜的种群动态模型为N_((t+1))=RN_((t))exp((-0.77P)/(1+0.77×0.00259N_((t)))当 R 与 P 取定值时,N_((t))对 N_((t+1))的上升或下降起决定性作用。

The life history and the predation efficiency of Chrysopa boninensis was studied under laboratory condition. The mean duration of the eggs required 3.1 days to hatch, the 1st instar lasted 3.2 days, the 2nd 2.4 days, and the 3rd 3.3 days, giving a larval stage of 8.9 days. The pupal satge lasted 9.2 days. Males lived a mean of 61.8 days and females a mean of 101.7 days. The pre-oviposition period averaged 8.4 days. A mean of 400.3 eggs was laid by each female, the maximum being 746 eggs. Females laid the...

The life history and the predation efficiency of Chrysopa boninensis was studied under laboratory condition. The mean duration of the eggs required 3.1 days to hatch, the 1st instar lasted 3.2 days, the 2nd 2.4 days, and the 3rd 3.3 days, giving a larval stage of 8.9 days. The pupal satge lasted 9.2 days. Males lived a mean of 61.8 days and females a mean of 101.7 days. The pre-oviposition period averaged 8.4 days. A mean of 400.3 eggs was laid by each female, the maximum being 746 eggs. Females laid the greatest number of eggs during the period from 16 - 24 days after emergence. C. boninensis was well adapted to wide variety of relative humidity and only the percentage of cocooning was affected by humidity.An average of 149.1 larvae of the citrus leaf-miner, Phyllocnistis citrella, were consumed with each green lacewing larva, with the increase of age of larvae the predation capacity was gradually increased. The optimum temperature for the predation efficiency is 35℃, under 15℃ and over 40℃, it was very low. The result can be described by the following equation: Na = 0.0105775(r-35)2+8. 1907336The effect of humidity on the predation efficiency can be described by using Logistic curve:The funtional response of the green lacewing to citrus leaf-miner was the Holl-ing 's II type, which can be desribed by using Holling 's disc equation:Na =1.1756671N/(1+0.1689855N)Mutual interference affected the predation efficiency of C. boninensis. The funtional response to itself density can be described by using Watt's equation:A = l0.6905696p-0.1091787 and the predation rate was.E = 0.7622331p-0.4811209