Abstract: Angelica sinensis is an important traditional medicinal herb in China. Makou disease caused by several fungi, nematode and insects is becoming more and more serious in South Gansu, a major production area of the herb, as rotation period is shortened due to land deficiency. Here we report the control efficiency and growth promotion effects in heavily infested field in Tanchang County on the herb and the diseases of two microbial compound preparations, “Baojialing” and “Fenzuan”, which contain Metarhizium anisopliae, Beauveria bassiana and Trichoderma harzianu, and Bacillus subtilis and Gliocladium roseum, respectively. Investigation demonstrated that both the preparations could promote growth of the herb and reduce the disease occurrence when they were mixed with fine dry soil and delivered into planting-hole during transplantation of the herb. However, it is not the truth that the higher dosage the better effect. In fact, among the 3 dosages of “Baojialing” tested, the lowest dosage (75 kg/hm²) expressed the best control efficiency against the disease by 63.66% and highest yield increment rate by 54.84%. Quite similarly, the lowest dosage (37.5 kg/hm²) of “Fenzuan” among the 3 ones tested also showed the best effects in control efficiency (45.78%) and growth promotion (40.30%). We analysed the reasons of the phenomenon and suggested a lower application dosage although a higher dosage could increase the rate of top-graded commercial roots of the herb. Conclusively, “Baojialing” and “Fenzuan” are two effective microbial preparations deserving extension in large area in Angelica sinensis production.

Key words: Angelica sinensis, makou disease, control effect, growth-promotion