20 January 1998, Volume 1 Issue 1

    

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研究论文
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  Host Selectivity of American Leafminer (Liriomyza sativae Blanchard)

  Liu Qing;Jiang Yuwen

  . 1998, 1(1): 4-0.

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  Using the number of feeding puncture as the selectivity indicator,we found in laboratory that the selectivity order of American leafminer to the 22 kinds of vegetables is pea family>gourd family>nightshade family>mustard family and leaf vegetables;In the non-choice test,American leafminer could feed and oviposit on nine of ten kinds of vegetables and complete the whole generation. However the biological parameters were affected obviously in some unpreferential vegetables. This non-choice test sugge...
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  Studies on the Toxicity and Field Effectiveness of Imidacloprid to Greenhouse Whitefly

  Ju Zhengli;Zhu Guoren;Zhang Youjun et al.

  . 1998, 1(1): 5-0.

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  Laboratory and field trials were conducted to evaluate the efficacy of imidacloprid to control Greenhouse whitefly. The field effectivenesses of 40～80mg/L of 20% imidacloprid at 1～15 days were 75.6%～96.5%,which were significantly higher than that of 100mg/L of 20% fenpropathrin. Imidacloprid showed stronger toxicity to Greenhouse whitefly than fenpropathrin. Its LC50 was only 1/100 of fenpropathrin s. 
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  Breeding of Heading Chinese Cabbage Resistant to TuMV

  Su Xuejun;Zhang Huanjia;Yang Xianmei et al.

  . 1998, 1(1): 6-0.

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  Four combinations of heading Chinese cabbage inbred lines resistant or susceptible to TuMV were made to screen resistance to TuMV and typical ovate head type which has leaf tip closing on the top,but not overlapping. By pedigree method,induiduals from each segregation generation were identified for resistance and head type. After four generations,26 inbred lines with resistance and ideal headtype were obtained. 
试验研究
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  Studies on Fertilization of Nitrogen,Potassium and Boron in Lotus Roots

  Li Guibao;Sun Kegang;Jiao You et al.

  . 1998, 1(1): 7-0.

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  The combinated use of N,K and B increased leaf size and yield of lotus roots. The highest yield and profit,5.7t/ha and 15812 yuan/ha,were obtained when 270kg N,120kg K2O and 15kg B per hectare were used together. Deficiency of B,K and less use of N influenced yield greatly. Application of B fertilizer gained maximum profit. One kilogram B fertilizer could increase profit from 720 to 2469 Yuan/ha in the experiments. 
研究论文
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  Starch Content of Potato Varieties in China

  Teng Weili;Wang Xinwei

  . 1998, 1(1): 8-0.

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  Starch contents in 673 accessions of potato varieties were analysied. Among these varieties there were 50 accessions which starch content surpassed 18%. 
品种选育
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  Breeding of a New F1 Hybrid of Hot Pepper‘Longjiao No. 1’

  Wang Lanlan;Cheng Hong;Xu Zhen et al.

  . 1998, 1(1): 9-0.

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  Longjiao No. 1 is a F1 hybrid of hot pepper with desirable traits including big fruits,thick pulp,good quality,good bear fruit property,high yield and resistance to TMV. The variety is suitable to plant under plastic film or on open field. The average yield was 52.6～60t/ha,30% higher than check‘Lanzhou Yangjiao’. 
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  Breeding of Carrot Varieties‘Jinhong No. 1 and Jinhong No. 2’

  Wang Yong;Duan Yu;Ren Xiaoyun et al.

  . 1998, 1(1): 10-0.

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  Jinhong No. 1 and No. 2 were bred by crossing carrot male sterile line which was selected from Russia Nante and inbred lines H93-2-1 and H92-4-1 from Japanese Xinheitian. Their growing period were 105～110 days and 115～120 days respectively. Their succulent roots were long-cylinder,orange-red colour,60～67.5t/ha,increasing 15%～20% than that of Xinheitian and there were higher nutrition contents in carbohydrate,soluble-sugar,VC,VD,VA etc. Two varieties have been extending in provinces of Inner Mongolia,Tianj...
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  An Early F1 Hybrid of Tomato——‘Longfan No. 3’

  Song Yuanning;Shao Jingcheng;Yang Yonggang

  . 1998, 1(1): 11-0.

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  ‘Longfan No. 3’is a new early F1 hybrid of tomato crossing between early parents. Fruits are flat round,red and uniform and 135～150g per fruit. Average yield was about 5000kg/667m2. Compared with the contrast (‘Zaofeng’),it was 7 to 10 days earlier than‘Zaofeng’,a popular early variety. It is suitable to grow in Gansu,Qinghai,Inner mongolia and so on.