Be in China, cotton produces the biggest menace to come from insect pest, among them the culprit is cotton boll bug. 1992, chinese the Huanghe valley ever had erupted large-scale cotton boll insect pest, created China north district the cotton crop loss of about 30 ％ , caused about 10 billion yuan pecuniary loss to country and cotton grower.
Turn to ｔ of this kind of B whether can gene cotton cause edaphic medicaments remain, cause “ to turn thereby gene ” pollution, wu Kongming explains insecticide of ｔ saying B began to had been sold on the international market 1960, it is thought to be opposite person, fish, plant, microbial reaching most insect is hurtless, “ its turn after gene composition enters soil, control in 3 days about, OK and all degradation. ”
He turns in affirmation while gene cotton weighs big effect, also point out: “ the action of every kinds of technology is opposite, b ｔ cotton also can kill the larva of a few moth or butterfly at the same time, and do not spray after pesticide, bug of cotton boll of old natural enemy was done not have, but can cause Xiang of Chinese toon elephantine blind this kind of small natural enemy. ”“ and to B ｔ cotton, after the course is cultivated for a long time, whether can cotton boll bug produce resistance to the action of a drug to it, make this kind of cotton final lose effectiveness, still need further research. ”
Wu Kongming says, turn the abroad that gene cotton studies besides this project imports breed this kind outside, china turns in development the technology on gene cotton project also matures gradually, china is at present annual cotton cultivates an area to be in about 500 - 6 million hectare, homebred turn gene cotton cultivates an area to occupy 70 ％ left and right sides.
2007, china is cultivated turn gene cotton makes an appointment with 3.5 million hectare, reduce use insecticide to amount to 140 thousand tons. “ is right for Chinese farmer, this kind turns of gene cotton help advance somebody's career the process does not need special agricultural apparatus, also do not have an influence to daily cultivation. ” Wu Kongming says.
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