Studies On The Chemical Control Techniques Of Panicle Disease In Late Rice

The diseases occurred in the rice growing stage from booting to ripen were refered to as panicel disease,it is the very important period for the yield,also a numerous diseases infestation period.These diseases usually caused the function leafs wilt,reduse maturing rate and weight per one thousand grainds.The panicel diseases normally can cause 10%-20%,severely affected paddy can cause 50%yield lose.The result from antibacterial experiment indicated that propiconazole 30%EC provide significant antimicrobial activities on Pyricularia grisea,Ustilaginodea virens,Rhizoctonia solani,Acrocylindrium oryzae.under the mass concentration level of 10mg/L,the efficacy up to 80%,propiconazole provide the best antimicrobial activitie within 10 fungicides,the efficacy on Acrocylindrium oryzae Saw was 87.56%,on Pyricularia grisea,was 93.38%,on Ustilaginodea virens was 92.86%and on Rhizoctonia solani was 99.76%.tebuconazole and diniconazole provide a better antimicrobial activitie on Pyricularia grisea with the efficacy of 72.79%and 70.31%,also provide a good antimicrobial activitie on Rhizoctonia solani and Acrocylindrium oryzae Saw with the efficacy up to 80%.The remain products showed poorer antimicrobial activitie on Acrocylindrium oryzae Saw with the efficacy from 24.12%to 36.47%.Field trial of propiconazole,tebuconazole,validamycin and diniconazole showed the similar results to the indoor's trial results.Propiconazole provide the best control on panicel diseases in all testing products.The field tank mixture trial also showed the synergy was no significant difference between diniconazole,tricyclazole,triadimefon and carbendazim.The application window testing results showed the first spray in 3～5 days before heading and second spray in heading stage provide the good control.The organosilicon mix with fungicide trial result indicated that the synergy organosilicon mixed with WP formulation was prior that mixed with SC or EC formulation.Different sprayer used in control also tested.The results showed that motorized knapsack provide the best control,manual sprayer Weishi-16P better then manual sprayer Gongnong-16.