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测试了有机硫熏蒸剂大扫灭(Dazomet)对三七(Panax notoginsengWall.)根围几种主要病原生物:线虫、细菌和真菌的最低灭生浓度(MBC值)分别为≥7.8、≥31.2和≥125μg/mL。4种主要病原真菌:立枯病丝核菌(Rhizoctoni solani)、根腐病菌毁坏柱孢霉(Cylindrocarpon destructant)、镰孢霉(Fusariumspp.)和黑斑病交链孢(Alternaria tenus)的MBC值分别为≥31.2、≥62.5、≥125和≥125μg/mL。钾-威百(K-Vapam)对线虫、细菌和病原真菌的灭生活性与Dazomet相当。连作三七田播种前和移苗前用98%大扫灭粉粒剂20~40 g/m2和35%钾-威百液剂30~50 mL/m2进行耕作层土壤熏蒸处理,对三七出苗和成苗率无显著影响;杂草和线虫发生量比对照分别减少90%~95%。播前处理比对照苗病发生率降低45.0%~82.5%,移苗前处理苗病发生率降低35.0%~50.0%。适当充足的土壤含水量、适时彻底的土壤毒气排除对提高药效和避免残毒对后茬药害至关重要。
The main endogenous pathogens of Dazomet on Panax notoginseng Wall were tested: the lowest MBC of nematodes, bacteria and fungi were ≥7.8, ≥31.2 and ≥125μg / mL. The four major pathogenic fungi, Rhizoctonia solani, the MBC value of the root rot destroying Cylindrocarpon destructant, Fusariumspp. And Alternaria tenus Respectively, ≥31.2, ≥62.5, ≥125 and ≥125 μg / mL. Potassium - Vapam (K-Vapam) on nematodes, bacteria and pathogenic fungi inactivation and Dazomet quite. Even before the Panax pseudoginseng field before sowing and before transplanting seedlings with 98% sweeping powder granules 20 ~ 40 g / m2 and 35% potassium - Wei Wei liquid agent 30 ~ 50 mL / m2 farming soil fumigation treatment of Panax notoginseng Emergence and seedling emergence rate had no significant effect; the incidence of weeds and nematodes were reduced by 90% ~ 95% compared with the control. Pre-sowing pre-treatment than the control of the incidence of disease reduced by 45.0% ~ 82.5%, Miao pre-Miao pre-treatment of the incidence of reduced 35.0% ~ 50.0%. Appropriate adequate soil moisture, timely and thorough removal of soil gas to improve efficacy and avoid residual pesticides is essential after the stubble.