系統性Benomyl劑對稻熱病稻紋枯病防治作用之研究

Studies on the Control of Rice Blast and Sheath Blight of Rice with Benlate

簡錦忠(C. C. Chien) ； 朱啓魯(C. L. Chu)

《中華農業研究》 22卷1期 (1973/03) Pp. 41-46

https://doi.org/10.29951/JARC.197303.0005

摘要

本研究係探討水稻秧田時期Benlate水和劑對稻熱病及稻紋枯病防治作用之效果。且將所得結果簡述如下：
Benlate水和劑施於土壤中育苗時，可預防稻熱病之發生，其使用濃度爲乾燥土壤1公斤中加Benlate l公克之效果最佳，土壤5公斤中施該劑1公克區至播種後第30天之預防效果極佳，但第35天後即稍被爲害，土壤10公斤中施該劑1公克區雖然稍可抑制稻熱病之發生，但其效果並不顯著。
將取其稻莖、葉片接種稻紋枯病菌菌核時，葉鞘部位皆無法抑制病菌之侵害，而葉片上，新葉片比老葉片之抑制能力較強。Benlate之使用濃度愈高，抑制能力亦愈強。
取處理稻苗作成稻苗煎汁培養基，培養稻熱病菌及稻紋枯病菌之結果，Benlate l公克施於土壤5公斤區就有抑制稻紋枯病菌之效力，土壤10公斤中施該劑1公克區之抑制能力較差，但對稻熱病菌，Benlate處理區皆能抑制該菌之生長，且頗爲顯著，由此亦可推測Benlate對高溫度頗具穩定性。

並列摘要

The Benlate was mixed into the soil before sowing the rice seeds in order to under-stand the effects of the systemic fungicide to the blast and sheath blight of rice. The results are summarized as follows:
The Benlate applied into the soil before rice sowing could prevent the occurrence of rice blast, and the best treatment was found at the rate of 1/1,000 (one gram of Benlate to 1,000 gram of dry soil). At the rate of 1/5,000, the best control was obtained 30 days after sowing, but its effect were decreased after 35 days. However, there were no significant effect to rice blast at the rate of 1/10,000.
The rice stems as well as leaves were collected from the various treatments, and were inoculated with sheath blight fungus. The results showed that stem of sheath could not inhibit the disease. The leaves, however, did show the inhibition of sheath blight, especially the newly developed leaves. Moreover, the higher concentration of Benlate was used, the stronger inhibition of the disease was observed.
When the pathogens of rice blast and sheath blight respectively were cultured in decotion medium made by the seedlings raised in Benlate treated soil, the inhibition effect to the sheath blight fungus was found at the rate of 1/5,000 while there was only less effect at the rate of 1/10,000. All media made by seedling grown in Benlate treated soil inhibited the development of blast fungus. The results suggested that the chemical absorbed by the rice plant could remain in plant tissue and did not lose its effect after heat treatment.