降香黄檀炭疽病药剂筛选及林间防效

为了筛选出防治降香黄檀炭疽病的环境友好型药剂,本文测定了10种杀菌剂的室内毒力,并从中筛选出毒力较强的药剂进行林间防效试验。结果表明:25%丙环唑EC,60%唑醚·代森联WG和40%氟硅唑EC对降香黄檀炭疽病菌的毒力较强,其EC50分别为0.12,0.15和1.12 mg/L。其他供试药剂的EC50分别为:75%百菌清WP231.42mg/L,10%苯醚甲环唑WG 3.60mg/L,80%醚菌酯WG 1.58mg/L,70%甲基硫菌灵WP 4.51mg/L,3%中生菌素WP 19.36mg/L,80%代森锰锌WP 79.76mg/L,80%多菌灵WP 11.47mg/L。考虑到氟硅唑、唑醚·代森联价格较高,建议将这两种药剂使用在降香黄檀苗木炭疽病的防治上。人工林炭疽病的防治采用25%丙环唑EC、80%醚菌酯WG、70%甲基硫菌灵WP和3%中生菌素WP,每隔15d依次施用,林间防治效果达到71.53%,明显高于其他防治方法。因此,在人工林降香黄檀炭疽病的防治中采用这4种药剂每隔15d依次施用可以有效控制降香黄檀炭疽病的暴发。喷雾时间应选择在阴天或晴天早晨露水干后8:00-10:00或者15:00-17:00。

The screening and field efficacy of effective fungicides against anthracnose of Dalbergia odorifera

In order to screen pesticides against anthracnose of Dalbergia odorifera,the indoor toxicity and the field control efficacy of ten fungicides were investigated.25％ propiconazole EC,60％ pyraclostrobin · metiram WG and 40％ flusilazole EC showed the strong virulence against anthracnose of D.odorifera with EC50 values of 0.12,0.15 and 1.12 mg/L,respectively.The EC50 of 25％ chlorothalonil EC was 231.42 mg/L,10％ difenoconazole WG was 3.60 mg/L,80％ kresoxim-methyl WG was 1.58 mg/L,70％ thiophanate-methyl WP was 4.51 mg/L,3％ zhongshengmycin WP was 19.36 mg/L,80％ mancozeb WP was 79.76 mg/L,80％ carbendazim WP was 11.47 mg/L.Of all the tested pesticides,40％ flusilazole EC and 60％ pyraclostrobin · metiram were recommended to control seedling anthracnose of D.odorifera because of their higher price.The 25％ propiconazole EC,80％ kresoximmethyl WG,70％ thiophanate-methyl and 3％ zhongshengmycin WP were recommended for prevention and control of anthracnose on plantation of D.odorifera.When these four pesticides were applied in turn every 15 days,the control effect reached 71.53％,which was significantly higher than that of other control methods.It should be sprayed between 8:00-10:00 am on cloudy or sunny day,or between 15:00-17:00.