Management of Late Blight of Potato caused by Phytophthora infestans through Botanical Aqueous Extracts (original) (raw)
Related papers
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.
2017
In vivo study was conducted to evaluate the efficacy of foliar application of garlic extract and two chemical fungicides (ridomil and z-force) in the reduction of late blight caused by Phytophthora infestans, increase of potato biomass and total tuber yield in natural field condition. The field experiment was conducted in Machambe village, Bokkos Local Government Area of Plateau State. Certified seeds were obtained from the National Root Crop Research Institute, Kuru, Plateau State, Nigeria. Potato seeds were grown in four row plots, 30-meter-long with spacing of 70cm between rows and 30cm within rows. Experiment was laid out in a Complete Randomized Block Design (CRBD) with four replications. Foliar sprays of 0.4 g/l Ridomil, Z-force and garlic extract respectively, at a 3day interval soon after first visible symptoms appeared to reduced disease incidence and resulted in higher biological and tuber yield compared to control (unsprayed plots). Ridomil and garlic extract were most ef...
Botanical Control of Late Blight of Potato
Nepal Journal of Science and Technology, 2011
Late blight caused by Phytophthora infestans (Mont.) De Bary is one of the most devastating diseases of potato. Although a large number of synthetic fungicides have been recommended to control this organism, most of them have proved to be pollutive, carcinogenic and the pathogen develops resistance quickly. Botanical control is one of the safe substitutes to be explored to control this phytopathogen. In the present study an attempt has been made to evaluate the antifungal activity of plant extracts against the above pathogen. Crude ethanolic extracts of five different plant materials viz. Brassica nigra, Cinnamomum camphora, Eupatorium adenophorum, Lantana camara and Melia azedarach were screened and tested against the fungal isolate of P. infestans. The antifungal activity of the crude extracts was evaluated by agar well diffusion method and two fold broth dilution method. The moisture content was highest in the twigs of L. camara and lowest in the cake of B. nigra. C. camphora gav...
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...
Plant Protection , 2019
A bulk of potato varieties were screened against Phytophthora infestans causing the late blight of potato. Almost all the potato germplasm showed a varying response against the devastating pathogen at Okara and Sahiwal. Field trials were consisted of screening of germplasm, area under disease progress curve and chemical management of the disease by using the various fungicides. Randomized complete block design was used for the research at both locations. Out of 68 genotypes/ varieties 16 were susceptible, 20 moderately resistant, five highly susceptible and 27 as moderately susceptible. Maximum disease incidence was recorded on Desiree and Cardinal (90%) followed by Santee (83.33%). The maximum mean disease severity of 9.48 was noted on Cardinal followed by Desiree 9.11 and Karoda 9.0 with the area under disease progress curve 28.55, 27.33 and 26.00 respectively. The results showed that 5gm/ L was the best dose against the suppression and control of the potato late blight under the field conditions. Azoxystrobin which is a new chemistry fungicide found to be the best chemical treatment against the late blight of potato followed by the copper oxychloride-based fungicides Cobox which also showed the best response. Aliette, Antracol, Tebuconazole and Mancozeb were also played a role to minimize the disease yet their higher concentration was even not so effective to combat the disease. Mancozeb was not found to be effective to control the disease as compared to the other three fungicides and orange oil extract.
2022
Potato is the third important food crop in Bangladesh and Bangladesh ranked as third and seventh in Asia and in the world, respectively. But potato production greatly affected by the late blight of potato caused by an oomycete, Phytophthora infestans (Mont.) de Bary worldwide. Application of need-based fungicides is the key factor to control this disease and to avoid development of fungicide resistance in P. infestans. Experiments were conducted in both in vitro and in field condition to evaluate some selected chemical fungicides to identify the best one to control the late blight disease of potato. The results of in vitro test revealed that all the fungicides inhibited the growth of P. infestans by 94% over control. But the results of field experiment conceded that the lowest late blight severity was found in T 10 (Curzate M8) (0.49%) followed by T 6 (AcrobateMz) (0.52%), T 8 (Micra) (0.59%), T 7 (Xtramyl) (0.61%), T 3 (Daconyl) (0.84%), T 5 (Secure) (1.28%), T 9 (Sanoxanyl) (1.43%), T 1 (Unilax) (1.83%), T 2 (TemperM) (2.58%) and T 4 (Amiscore) (6.34%) at 71 DAP while the maximum late blight severity (95.33%) was observed in T 0 (water as control). The highest yield was obtained in T 10 (Curzate M8) (25.94 t/ha) followed by T 6 (AcrobateMz) (25.67 t/ha), T 5 (Secure) (25.22 t/ha), T 7 (Xtramil) (24.61 t/ha), T 8 (Micra) (24.61 t/ha) and T 9 (Sanoxanil) (23.67 t/ha) which were statistically similar and the lowest (8.39 t/ha) yield was observed in T 0 (water as control). The highest Benefit Cost Ratio (BCR) was obtained from when potato plants were sprayed with T 10 (Curzate M8) (1.02) following by T 7 (Xtramil) (0.99), T 8 (Micra) (0.99), T 6 (AcrobateMz) (0.92), T 9 (Sanoxanil) (0.90), T 5 (Secure) (0.89), T 1 (Unilax) (0.80), T 3 (Daconil) (0.74), T 4 (Amiscore) (0.71) and T 2 (TemperM) (0.44) compared to control T 0 (water as control) (-0.30). The results indicated that application of these fungicides yielded a benefit of Tk. ranged by 0.44 to 1.02 over the investment of Tk. 1.00. Therefore, identification of a number of potential chemical fungicides might be useful in the alternate use of these fungicides against late blight of potato in the field.