Evaluation of Cytrol and Revus Fungicides Against Late Blight of Potato (original) (raw)
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Effectiveness of different fungicides against late blight (Phytophthora infestans) of potato
Plant Protection
An investigation was carried out at Potato Research Station Sialkot during 2014-15 and 2015-16 crop season to find out suitable fungicides to combat the late blight disease of potato. Six fungicides viz. Ridomil Gold, Defeater Plus, Puslan, Success, Aleitte and Dithane M-45 were tested against the disease in two consecutive seasons. All the fungicides reduced the late blight disease incidence of potato over control. Among the fungicides, alternate spray of Ridomil Gold and Dithane M-45 was found highly effective to minimize the late blight and to increase the yield of potato.
2020
Late blight is one of the most destructive diseases causing severe yield losses of potato in Kashmir valley. So, In the present study, four different protectant fungicides (mancozeb 75 WP, chlorothalonil 75 WP propineb 70 WP) were evaluated at field level at three different concentrations (1.5%, 2% and 2.5%) by spraying at weekly intervals starting from symptom exhibition to the ten days before dehaulming stage during cropping seasons 2016 and 2017. With this study, it was found that all the fungicides (mancozeb, propineb and chlorothalonil) were equally superior to control (water spray) in reducing the blight incidence from 75.55 to 31.03 per cent. There existed a significant interaction between fungicides and their concentrations. All the three test fungicides at C1-C3 concentration reduced the disease incidence to 24.44-51.17 per cent from 75.55 per cent observed in water sprayed check. Mancozeb 75WP was highly effective in reducing the late blight disease with a least mean disea...
Agrotechnology, 2018
Late blight of potato which is caused by Phytophthora infestans, (Mont) de Bary is an important disease of potatoes (Solanum tubersolum) and is a prevalent disease in all potato producing areas of Ethiopia. A field experiment was conducted for two consecutive years (2016 and 2017) under the main rainy season to develop integrated management options for late blight disease of potato at Bursa District, Sidama Zone, SNNPRS, Ethiopia. Two improved varieties having different level of resistance, four registered fungicides, and two unsprayed plots (control) were arranged in a factorial randomized complete block design with three replications. The result showed that all fungicides significantly reduced the infection of late blight as compared to the unsprayed treatments at both seasons. Two way interaction of variety by fungicide showed significant difference on controlling disease severity and increasing tuber yield in 2017. Fungicides Matco (Metalaxyl-8%+Mancozeb-64%) and Boss (Metalaxyl+Mancozeb) 72% WP significantly reduced severity of the disease as compared to Bacticide (Copper Hydroxide) and Mancozeb (Diathane-M45) in 2017 cropping season. Whereas in 2016 the disease pressure was low as the result there was no significant difference between fungicides. Depending on the fungicides efficacy and varietal reactions to the disease (21.82 to 30.47 t ha-1) and (20 to 36.84 t ha-1) tuber yield were obtained from the sprayed plot in 2016 and 2017, respectively. On the other hand from unsprayed plots, 10.63-18.63 t ha-1 and 8.8-17.4 t ha-1 tuber yield was obtained in 2016 and 2017 cropping seasons respectively. The mean yield advantage of fungicide sprayed plots for both varieties was 62% as compared to the unsprayed ones. The study confirmed that host resistance level and fungicide efficacy played an important role in host-pathogen-fungicide interaction to reduce the severity of late blight on potato. Therefore, it was confirmed that the combined effects of growing moderately resistant cultivars with the application of fungicides Matco at two spray frequency in 10 day intervals reduced the yield loss and damage caused by late blight even under high late blight pressure.
Efficacy of Fungicides Against Late Blight of Potato
Agricultura, 2018
Potato varieties grown in Nepal have low levels of general resistance to late blight. Mostly the commercial potato farmers rely on fungicide applications for control of Phytophthora infestans, the causal agent of late blight. Field study was conducted in winter 2017 at research field of Institute of Agriculture and Animal Science, Lamjung Campus, Sundarbazar, Lamjung, Nepal to evaluate the efficacy of commercially available fungicides against late blight of potato. Experiment was laid in randomized complete block design with five replications. Treatments consisted of Dimethomorph 50% WDG@1.5g/L, Cholothalonil 75% WP @ 2g/L, Mancozeb 75% WP@ 2.5g/L and Trichoderma @ 2ml/L as recommended for field use and a variant with no application of fungicide (only tap water) was used as a control. Spore suspension of respective plant pathogen was inoculated twice @ 500 ml per plot (4m2). Treatments were applied after the appearance of first blight symptom and level of disease development was fol...
Forecast and Need Based Fungicide Application for Effective Management of Late Blight of Potato
Journal of Krishi Vigyan, 2018
Late blight caused by Phytophthora infestans (Mont) de Bary is one of the most dreaded diseases of potato worldwide and cause signiicant losses in production. It affects both potato foliage in the ield and tubers in storage. A number of management techniques for late blight have been developed and used throughout the world. Effective control of this disease requires an integrated disease management approach. Fungicides alone can't control late blight effectively, but should be used as a tool in an integrated management. In present studies, weather forecast based targeted application of fungicides with recommended cultural practices (use of healthy seed, seed treatment, proper spacing and hilling etc.) were used for effective management of the disease. Preventive fungicide applications were given, by identifying conducive period for disease development using local weather forecast. Effective management of disease i.e. 92.17 and 90.93 per cent during 2014 and 2015, respectively was achieved in demonstration trials by following prophylactic spray of mancozeb, sprays of cymoxanil 8% + mancozeb 64%, just after disease appearance, followed by need based sprays of mancozeb and cymoxanil 8% + mancozeb 64% at 10 days interval. contrary to this , in control i.e. farmers' practice, disease incidence of 95.83 and 96.94 per cent was recorded during 2014 and 2015, respectively, as farmers sprayed fungicides indiscriminately, only after disease appearance.
Journal of Biology Agriculture and Healthcare, 2014
Potato is the most worldwide important tuber crop. Potato late blight disease is the major bottleneck in potato production in Ethiopia. The Field experiments were carried at Haramaya University during 2010 to determine the efficacy of reduced dose of fungicide sprays in the management of late blight disease on selected potato varieties. Combinations of five potato varieties with different levels of resistance and five rates of Ridomil applications were used. The experiment was laid out in a factorial arrangement in randomized complete block design with three replications. The combination of moderately resistant, moderately susceptible and susceptible varieties with different rates of Ridomil applications varied significantly (P < 0.001) in disease severity, disease progress rate and area under disease progress curve. Onset of the disease was delayed by almost 20 days on the moderately resistant varieties as compared to the moderately susceptible and susceptible varieties. Up to 80, 76, 75.5, 69 and 68% severity reduction was obtained from the varieties Bedassa, Gabissa, Chiro, Harchassa and Zemen plots treated with Ridomil at 3 kg ha-1 rate of application, respectively. The highest disease severity and lowest yield were recorded from the control plots, especially on moderately susceptible and susceptible varieties. The best management of late blight and high marginal rate of return was obtained on plots treated with combinations of all tested potato varieties and 0.75 kg ha-1 Ridomil applications followed by 1.5 kg ha-1 Ridomil. The lowest rate of marginal return was obtained at combinations of these varieties with the 3 kg ha-1 Ridomil. This study revealed that reduced rates of Ridomil resulted in better management of potato late blight. However, further studies at different agro-ecological zones of the country are important for preference of potato varieties and specific rates of Ridomil as opposed to approval of the blanket recommendation of the manufacturer.
Late Blight of Potato (Phytophthora infestans) I: Fungicides Application and Associated Challenges
Potato (Solanum tuberosum L.) has been remained an important agricultural crop in resolving global food issues through decades. The crop has experienced enormous growth in terms of production throughout the world in recent decades because of improvement in agricultural mechanization, fertilizers application and irrigation practices. Nevertheless, a significant proportion of this valuable crop is still vulnerable to losses due to prevalence of different viral, bacterial, fungal and nematodes infestations. Late blight, caused by Phytophthora infestans (Mont.) de Bary, is one of the most threatening pathogenic diseases which not only results in direct crop losses but also cause farmers to embrace huge monetary expenses for disease control and preventive measures. The disease is well known for notorious 'Irish Famine' which resulted in drop of Irish population by more than 20% as result of hunger and potato starvation. Globally, annual losses of crop and money spend on fungicides for late blight control exceeds one trillion US dollars. This paper reviews the significance of late blight of potato and controlling strategies adopted for minimizing yield losses incurred by this disease by the use of synthetic fungicides. Advantages and disadvantages of fungicides application are discussed.
Field efficacy of mandipropamid for the control of potato late blight
Pesticidi i fitomedicina, 2010
The efficacy of mandipropamid (Revus 250 SC) in controlling Phytophthora infestans in potato was evaluated in field trials. The efficacies of Revus 250 SC in comparison with standard fungicides Quadris (azoxystrobin) were tested in several localities in Serbia (Kasarske Livade, Valjevska Kamenica and Opovo) in 2007 and 2008. Both of the tested fungicides exhibited high efficacy in controlling potato late blight. The differencies in the efficacy of Revus 250 SC (96.3- 99.2%) and Quadris (94.1-95.5%) were insignificant. Our experiments showed that the investigated fungicide was highly effective against P. infestans even under high disease pressure.
A field experiment was conducted to find out the effects of different planting dates and fungicides in the control of potato late blight (Phytophthora infestans (Mont.) de Bary) on commercial TPS potato, variety HPS 7/67, at Rampur, Chitwan, during October 2011- March, 2012 under natural epidemiological conditions. The study consisted of four different planting dates, starting from 25th Oct. at ten days intervals and three fungicidal sprays (Acrobat, Dithane M-45, Jeebatu) and without spray as a check in split plot design with three replications. Planting dates were assigned to the main plots and fungicides to the sub-plots. The data revealed highly significant (p<0.01) difference between dates of planting for RAUDPC and tuber yield (t ha-1). Potato planted on 25th Oct. showed minimum RAUDPC value (0.34) of late blight and maximum tuber yield (16.65 t ha-1). Delaying in planting time, there was increased in RAUDPC value and decreasing tuber yield. Fungicides application was found highly significant (P<0.01) on RAUDPC and tuber yield (t ha-1). Acrobat sprayed plot had minimum RAUDPC (0.2114), maximum tuber yield (11.86 t ha-1). The increase in tuber yield over check was also highest in Acrobat-sprayed plots (67.63%), followed by Dithane M-45 (63.25%), and minimum in Jeebatu (5.98%). Considering disease development, tuber yield, efficacy and cost of fungicide application, Plantation of potato on 25th October and Dithane M-45 spray just after initiation of disease resulted most effective management of late blight of potato.