四川省利用水稻品种多样性间栽技术持续控制稻瘟病

Intercrop for rice blast management in Sichuan province

2002—2005年利用水稻品种多样性间栽控制稻瘟病技术在四川省18个市（州）113个县累计推广145．9×10^4hm^2，选用杂交稻和播稻品种搭配组合517个。结果表明，间栽播稻的平均发病率比净栽播稻下降56．97％，病情指数下降66．38％，控制有效率在22％～97％之间。间载杂交稻的平均发病率比净栽杂交稻下降28．95％，病指下降37．09％，控制有效率在32％～57％之间。其中杂播品种最佳组合为黄壳摇×川香优2号。竹丫谷×宜香优1577。4年水稻的平均复合产量为9598kg／hm^2，比净栽杂交稻提高产量7281kg／hm^2，增长8．68％。

The technique of using mixture planting for biodiversity to manage rice blast was extended in 113 counties of 18 prefectures in Sichuan province and the total area accounted for 145.9 × 104 hm^2 from 2002 to 2005. The combination of 517 with hybrid and glutinous varieties were chosen. The results indicated that the disease incidence and disease index of the glutinous rice in the intercropping were reduced by 56.97 % and 66.38 % than that of monoculture, respectively. And the disease incidence and disease index of the glutinous rice were reduced by 28.95 % and 37.09 % for hybrid varieties in the intercropping. In the intercropping, the control effect was between 32 % - 57 % for hybrid varieties and 22 % - 97 % for glutinous varieties. The best combination of glutinous and modem rice variety were Huangkenuo （glutinous） × Chuanxiangyou 2 （modem） and Zhuyagu （glutinous） × Yixiangyou 1577 （modern）. The mixed yield of hybrid and glutinous was 9598 kg/hm^2, and the yield is increased by 8.68% compared with that of their monocultures.