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(一)二化螟在江苏省中粳区、沤田区及晚粳区为害严重,大部分枯心苗均为其造成。白穗中幼虫数目相当高,最多一株有137头。 (二)二化螟的发蛾期,一般来讲,第一代盛发期约在6月中、下旬。第二代盛发期约在8月中、下旬。根据观察记载资料,望亭一带,1952年、1953年均在9月中、下旬又起高峰,可能有不完全第三代的出现。 (三)试验记录中指出,人为的移栽对蚁螟的生存,有抑制作用。在栽培制度上,应控制第一代蛾螟卵盛孵期,在秧田内进行。以期达到水稻少受二化螟的为害。 (四)水稻受二化螟为害后,除造成枯心苗白穗外,并造成有虫株。其百分率最高占14.5％。有虫株穗与健穗,穗重相差0.46克。千粒重最高相差3.09克。 (五)在稻根稻草中,二化螟越冬比例,稻根为43.41％,稻草为56.59％。 (六)在不同播种期;移栽期各处理间,受二化螟为害,差异显著。望亭一带适宜播种期、移植期,以5月25日播种,6月28日移栽为最佳。 (七)第一代螟卵之寄生率平均为25.46％。寄生蜂种类有:(1)日本赤眼蜂,(2)稻螟黑卵蜂。 (八)在防治上,除运用行之有效的治螟办法,如秧田捕蛾采卵、点灯诱蛾、剪除枯心苗和白穗、保护寄生蜂、处理稻根外,在栽培制度上,如何利用适宜播种期,减轻或免除二化螟灾害,为今后值得注意的问题。
(A) Chilo suppressalis in Jiangsu Province in the japonica rice, rice fields and late japonica serious damage, most of them are the result of dead seedlings. White spike in the number of larvae is very high, up to a strain of 137. (B) of the stem borer hair moth period, in general, the first generation Shengfa about in mid-June, late. The second generation Shengfa about in mid-August, late. According to observation records, Wangting area, 1952, 1953 are in mid-September, late peak again, there may be an incomplete third generation. (C) of the experimental records pointed out that the artificial transplanting on the survival of insects ants, have inhibitory effect. In the cultivation system, should control the first generation of moth oviposit incubation period, carried out in the seedling. In order to achieve less susceptible to rice stem borer damage. (D) of rice by the Chilo suppressalis damage, in addition to causing dry Xin white spike, and cause the worm strains. The highest percentage of 14.5%. Insect strains spike and healthy ear, spike weight difference of 0.46 grams. The highest difference between 1000 grain weight 3.09 grams. (5) In the rice straw, the proportion of overwintering rice stem borer was 43.41% for rice roots and 56.59% for straw. (F) in different sowing; transplanting period between the treatment, by the Chilo suppressalis, the difference was significant. Wangting appropriate sowing area, transplanting period, to sow on May 25, June 28 for the best transplanting. (G) The average parasitic rate of the first generation borer eggs was 25.46%. Parasite bee species are: (1) Japanese trichogramma, (2) black borer rice borer. (H) In the prevention and control, in addition to the use of effective methods of treatment of borers, such as seedling catching moths, lighting lure moths, cutting off the seedlings and white sparse seedlings, parasitic wasps to protect the rice roots, the cultivation system, How to make use of suitable sowing time and reduce or eliminate the disasters of Houttuyniae larvatus are the problems worth attention in the future.