Analysis of Control Efficacy of Seven Fungicides on Potato Late Blight
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Control efficacy of seven fungicides onA potato late blight was determined in field experiment.The Seven fungicides had obvious control efficacies on potato late blight.The best four fungicides were 25% Mandipropamid,50% Fluazinam,0.5% Matrine and 30% Azoxystrobin,and control efficacies of these fungicides were more than 80%.Followed fungicide is 45% triphenyltinacetate,68.75% Fluopicolide,and control efficacy was more than 70%.The worse fungicide was 52.5% Famoxadone + Cymoxanilm,and control efficacy was 65%.These fungicides should be recommended for use alternatively in potato production to avoid resistance.The results provided scientific references to the exploration of new method on potato late blight prevention and yield saving.Cite
Control efficacy of four fungicides on potato late blight was determined in field experiment.The results showed that four fungicides were effective for potato late blight control and yield prevention.The best fungicide was 687.5 g/L of fluopicolide 800 times liquid and 25% of mandipropamid1 700 times liquid.Yield was increased by 130% compared with the water control.The second control efficacy of fungicides was 52.5%famoxate 1 000times liquid and 53% ridomil gold 500 times liquid.
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[Objective]To screen out potato late blight (Phytophthora infestans) prevention fungicides. [Method]The three kinds of pesticides, respectively, 58% WP Metalaxyl MZ and 70% of the Antai Sheng WP and Silver Farley 687.5 g/L SC, were used to conduct the potato late blight control efficacy. [Result]The control efficacy of silver Farley on potato late disease was better than 58% WP metalaxyl MZ and 70% An Taisheng WP, and the recovery rate of yield loss reached 223.77%. [Conclusion]The results provided scientific references to the exploration of new method on potato late blight prevention, development of new effective fungicides, and improvement on effects of disease prevention and yield saving.
Phytophthora infestans
Metalaxyl
Disease Control
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As a result of long-term use of some limited broad-spectrum fungicides on controlling of potato late blight,pathogen resistance to the fungicides was increased,leading to reduced effect for late blight control.To screen the efficient,economical,and safe fungicide which might be used in future production,four fungicides(Ovraclostrobin · Dimethomorph 18.7% WG,Fluopicolide·Propamocarb 68.75% SC,Metalaxyl·Mancozeb 72% WP and Mancozeb 75% WG) were tested for their effect on late blight control at low,medium and high concentrations with the high concentration applied two times and low and medium concentration three times.The control efficiency for Ovraclostrobin·Dimethomorph 18.7% WG applied at the rate of high,medium and low was 71.08%,73.03% and 69.04%,respectively,followed by Fluopicolide·Propamocarb 68.75% SC,with the control efficiency of 62.09%,74.53% and 64.65%,respectively.The control efficiency of Metalaxyl·Mancozeb 72% WP was 56.91%,71.71% and 66.87%,while Mancozeb 75% WG was 46.52%,70.38% and 68.85%,respectively.These results indicated that Ovraclostrobin·Dimethomorph 18.7% WG and Fluopicolide·Propamocarb 68.75% SC had better control efficiency for late blight and remaining two fungicides also had certain effects.It is recommended that these fungicides should be used alternatively in potato production for late blight control.
Metalaxyl
Phytophthora infestans
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Six fungicides and one control were evaluated for their late blight control efficacy in order to select out the effective chemicals to prevent yield loss and poor quality of potatoes.All fungicides tested were effective for late blight control,of which Cyazofamid(10% SC) and Cymoxanil Mancozeb(72% WP) showed the best results for late blight control and yield prevention,followed by Famoxadone + Cymoxanilm(52.5%) and Sandofan M8 WP,and then by Fluazinam(50% SC) and copper hydroxide.
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The experiment was to determine the field control efficacy of seven fungicides to potato late blight.The results indicated that the control efficacy of Fluopicolide 68.75% SC(1 125 g / ha),Ridomil Gold-MZ 53% WG(1 500 g / ha),Flumorph + Mancozeb 60% WP(1 225 g / ha) and Curzate 72% WP(2 000 g / ha) were 88.38%,86.15%,84.55% and 81.68%,respectively.These were ideal chemicals to control potato late blight,and obvious for yield increase.Thus,these fungicides should be recommended for use alternatively in potato production.
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Metalaxyl
Phytophthora infestans
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Potato cultivars grown in Bangladesh have low levels of general resistance to late blight. As such, most commercial potato farmers rely on fungicide applications for control of Phytophthora infestans, the causal agent of late blight. Management of late blight of potato requires an integrated approach that includes rotation with non-hosts, resistant cultivars, cultural practices, and fungicides. The study on efficacy of some new fungicides against late blight disease of potato was conducted at ARS, Alamnagar Rangpur during rabi season 2010-2011 to select suitable fungicides against late blight of potato. Thirteen different fungicides were tested and all the tested fungicides showed significantly better performance over control. Considering percentage disease incidence T4,T6 and T12 showed better performance than all other treatment. In case of T4,T6 and T12 treatment disease reduction was more than 80 % over control. Significantly the highest tuber yield 25.5 t ha-1was obtained from T3 which was statistically similar to the yield of T2,T5 , T6, T9, T10, T11and T12 treatment whereas the lowest tuber yield 14.5 t ha-1 was obtained from control treatment. Field experiment was conducted from 2010 to 2011 to investigate the comparative efficacy of the fungicides. In the field, applications of fungicide that preceded the largest incremental increase in disease incidence provided the best control of disease or increased yield.Progressive Agriculture 26 (2): 103-108, 2015
Phytophthora infestans
Disease Control
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Potato early blight occurs severely in various main potato production areas in recent years,and therefore,fungicide test was carried on to control the potato early blight.The result indicated that the fungicides with better control efficacy were 25% Amistar(1 000 times),60% F Morpholine.mancozeb(600 times) and 52.5% Equation(2 000 times),their control efficacy being 87.71%,84.13% and 81.26%,respectively.Because their control efficacy is obvious,they should be recommended for use in potato production.
Phytophthora infestans
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[Objective]The aim was to screen out efficient,safe and economic agents for controlling potato late blight. [Method]Control efficacy of Mancozeb against potato late blight under different dosage,different formulations and different applied times was studied and demonstration was carried out,and then comparison tests were carried out with protective fungicides( Propineb and Oxine-copper) and several re preparations. [Result] The control efficacy of Mancozeb of different formulations had no difference,but increased with the increase of applied times. After potato late blight occurred,protective fungicides had no control efficacy basically. The combination of two times 70% Propineb WP and two times 68. 7% Fluopicolide SC was suitable,and the combination of two times 70% Propineb WP and three times 68. 7% Fluopicolide SC had the best control efficacy. [Conclusion] The results provide reference for control of potato late blight.
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In 2007,an field experiment to test four fungicides for control of late blight in potato is carried out in the main potato producing area in Mian-ning country,Liangshan.The four fungicides are 687.5g/LYnfinitoSE,70%AntracolWP,58%MetalaxylMancoZebWP and MetalaxylWP.The results show that the four fungicides have obvious effect on disease resistance of late blight of potato.But, 687.5g/LynfinitoSE has the best effect on produce-increasing and disease-controlling.
Phytophthora infestans
Disease Control
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