Use Pencycuron:Integrated Management of Rice Diseases Caused

Yangzhou pioneer chemical CO.,LTD

by Pyricularia oryzae, Rhizoctonia solani and Sclerotium rolfsii

Pyricularia oryzae, Rhizoctonia solani, and Sclerotium rolfsii are the most destructives pathogens of rice. Breeding works have had only limited success against P. oryzae, but for R. solani and S. rolfsii there are no resistant rice varieties are available. Application of fungicides is the most effective method to control fungal diseases. However, it is desired to minimize the use of agricultural chemicals because of growing environmental concerns. In this context, integrated management is an alternative of disease control. Bacillus sp. LB5 was used as a biocontrol agent in combination with soil solarization, soil amendments to control P.　oryzae, R.　solani and S. rolfsii. Fungicides were used to make comparisons. The optimum temperature for mycelial growth of P. oryzae and R.　solani was 28 oC. Under laboratory studies, Bacillus sp. LB5 was able to inhibit the mycelial growth of P.　oryzae, R.　solani, and S. rolfsii. Kasugamycin and Carbendazim mixture was the most effective fungicide which inhibited completely the spore germination and mycelial growth of P. oryzae at 1 and 10 ppm respectively. The EC50 values of mixture fungicide in vitro inhibition of spore germination and mycelial growth were 0.01 and < 1 respectively. Fungicide Mon inhibited 100 % of mycelial growth of R.　solani, and Mepronil inhibited 95 % of S. rolfsii at 100 ppm, with EC50 of 10 ppm and 8.7 ppm respectively. On the other hand, statistical results showed the combination of soil solarization, S-H mixtures and fungicide treated seed was the most effective approach to reduce the disease incidence of R. solani and S. rolfsii in rice seeding. This integrated method gives opportunities to reduce the use of fungicides to control soilborne pathogens. Bacillus sp. LB5 was ineffective in controlling the symptoms caused by rice blast and sheath blight under field conditions. Fungicides Tryciclazole and Mancozeb were applied to control rice blast, which reduced disease incidence to 0.7 %. Pencycuron controlled the severity of sheath blight to 16.5 % compared with 38.2 % in control plots.
So this report display use pencycuron is good to plant rice and pencycuron should be use widely