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本文着重报导了大螟产卵对作物生育期的选择,产卵叶位及其变化规律,田间卵量消长特点。 雌蛾产卵对作物生育的选择:在水稻上,有选择条件时,不选择已抽穗稻田产卵。在产卵田里,从分蘖末期至孕穗末期均可大量产卵,抽穗后卵量大减;无选择条件时,已抽穗稻田也可被选择大量产卵。在高梁上,当同时存在抽穗株和未抽穗株时,主要选择抽穗株产卵;早玉米苗期,主要选择五～八叶期植株产卵。 无论在水稻、玉米、高梁上,产卵叶位随着叶令期的增加,产卵部位逐渐升高,直至抽穗后大量产卵在顶叶叶鞘内侧。 大螟田间卵量消长特点:同田内不同螟种间与三化螟比较,盛卵期迟,盛卵期长;三代为害稻型多,不同稻型间,抽穗期早的,盛卵始期早,结束也早。不同作物间比较,高梁上三代大螟卵量极大,且盛卵期同主要受害稻型上的盛卵期基本吻合。玉米五叶期后大螟进入盛卵期,八叶期后卵量迅速下降。
This article focuses on the selection of the stem borer to oviposition period of crop growth, spawning position and its changes, the amount of growth and decline of eggs in the field. Female moth spawning choice of crop fertility: In rice, when there is a selection of conditions, do not choose has eared rice spawning. In the spawning field, a large number of spawning eggs can be spawned from the late tillering stage to the end of the booting stage, and the number of eggs after heading is greatly reduced. In the absence of selection conditions, the spawning paddy field can also be selected for spawning in large quantities. In the sorghum, when there are both heading and non-heading plants, the main choice of spawning spawning; early corn seedling stage, the main choice of five to eight leaves of the plant spawning. No matter in rice, corn, sorghum, spawning leaf position with the leaf period increased, the spawning site gradually increased until a large number of spawning eggs in the parietal lobe medial. Ovipogon field oocyte growth and decline characteristics: different in the same field with borer borer compared with the three borer, the late egg-laying period, long egg-rich period; three generations of more rice-type, different rice type, early heading, The end is also early. Compared with different crops, the eggs of the three generations of sorghum were very large, and the number of eggs in the three generations coincided well with that of the main affected rice. After the five-leaf stage of corn, the stem borer entered the egg-bearing stage and the amount of eggs dropped rapidly after the eight-leaf stage.