Chemical Control of Powdery Mildew of Apple in Warmer Climates of Himachal Pradesh, India

Gupta, D. S.; Sharma, J.N.

doi:10.17660/actahortic.2005.696.61

Cited by 3 publications

(3 citation statements)

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“…The present results can be used for better decision making well in advance to check the incidence and disease development in accordance with the weather. The present findings are corroborated by the works done by Gupta and Sharma (2009), Gupta and Sharma (2005) and Bana et al (2020).…”

Section: Effect Of Epidemiological Parameters On Powdery Mildew Of Ap...supporting

confidence: 91%

“…However the increase in relative humidity levels above 60 percent was found to be unfavourable for the disease development. The results are in conformity with the work done by Gupta and Sharma (2009). Similarly, correlation coefficient between mean air temperature and disease severity was found significant and negative (-0.544).…”

Section: Correlation Of Disease Severity With Meteorological Factorssupporting

confidence: 91%

“…Temperature and humidity were considered as an important factor for appearance and development of powdery mildew diseases. The results to a greater extent corroborate the findings of various workers (Monlar, 1971;Grushin, 1988;Gupta and Sharma, 2009;Tang et al, 2017) who reported high disease development under humidity conditions ranging from 20 to 65%. Data further indicated that partial correlation between disease severity and relative humidity (0.662) was highly significant and positive whereas with temperature and rainfall it was positive but not significant.…”

Section: Correlation Of Disease Severity With Meteorological Factorssupporting

confidence: 90%

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Prevalence and Epidemiology of Apple Powdery Mildew in Northwest Himalayan Region of Himachal Pradesh

Neg,

Tomar,

Bhandari

et al. 2024

IJEP

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A survey was conducted to assess the incidence and severity of powdery mildew of apples during April to July of 2020 and 2021 at the different locations of Kinnaur district, Himachal Pradesh, India. Assessment scale of Hofer et al. (2019) with slight modification was used for cultivar screening. Apple seedlings were grown in the pots in the polyhouse of the Department of Plant Pathology in order to test the pathogenicity of Podosphaera leucotricha. Pathogenicity was confirmed through inoculation tests by gently pressing diseased leaves on young leaves of five asymptomatic, potted one-year-old Gale Gala seedlings of apple. Five non-inoculated plants were used for a control treatment. Overall, twenty different apple cultivars were screened against powdery mildew planted under field conditions at Krishi Vigyan Kendra Sharbo, Kinnaur, Himachal Pradesh, India. Out of these cultivars, five cultivars viz. Red Delicious, Royal Delicious, Red Velox, Auvil Early Fuji and Oregon Spur II, were found to be less susceptible to Podosphaera leucotricha, causing powdery mildew of apples, while Granny Smith, Golden Delicious, and Gale Gala were found extremely susceptible. Gala series of cultivars were found to be extremely susceptible to the pathogen. Incidence of the disease ranged from 25.42% to 53.80% and severity from 39.75% to 66.25%, respectively. According to the present study the disease initiated during the first week of May and peaked in the month of July in district Kinnaur. Temperatures between 18–24°C and RH between 50–65% were found to be favourable for the disease development. The conditions in the region were found to favourable for disease development and spread.

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Section: Effect Of Epidemiological Parameters On Powdery Mildew Of Ap...supporting

confidence: 91%

Section: Correlation Of Disease Severity With Meteorological Factorssupporting

confidence: 91%

Section: Correlation Of Disease Severity With Meteorological Factorssupporting

confidence: 90%

See 1 more Smart Citation

Prevalence and Epidemiology of Apple Powdery Mildew in Northwest Himalayan Region of Himachal Pradesh

Neg,

Tomar,

Bhandari

et al. 2024

IJEP

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Kaolin-based particle film sprays reduce the incidence of pests, diseases and storage disorders and improve postharvest quality of ‘Delicious’ apples

2020

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Optimizing Use of DMI Fungicides for Management of Apple Powdery Mildew Caused by Podosphaera leucotricha in New York State

2022

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Powdery mildew, caused by the ascomycete Podosphaera leucotricha, is an endemic disease found wherever apples are grown that negatively impacts both tree vigor and fresh market yield. In the absence of durable host resistance, chemical management is the primary means of disease control. Demethylation inhibitor (DMI) fungicides are widely used to manage apple powdery mildew, but members within this fungicide class have been observed to differ in efficacy with respect to disease control. Moreover, debate exists as to the optimal timing of DMI fungicide applications for management of apple powdery mildew. In this regard, the goal of this study was to determine the best-use practices for DMI fungicides to manage apple powdery mildew in New York State. Multi-year trials were conducted to evaluate the potential differential efficacy performance of four common DMI fungicides, as well as additional trials to assess optimal application timing. In all years, we observed that treatments of flutriafol and myclobutanil consistently had the lowest incidences of powdery mildew compared to difenoconazole and fenbuconazole. In the 2018 and 2021 trials, the newly registered mefentrifluconazole was more comparable to the difenoconazole program with respect to powdery mildew disease incidence. We hypothesize that differences in DMI efficacy may be due to each fungicides’ water solubility and lipophilicity characteristics, and thus their ability to move systemically in the host or more easily penetrate the surface of germinating conidia. Applications timed between petal fall and first cover resulted in the lowest incidence of powdery mildew on terminal leaves of apple shoots compared to applications timed prior to petal fall. These observations are contrary to previous studies conducted in regions with differing climates. We also found that the incidence of secondary powdery mildew observed two weeks after petal fall was influenced by applications of DMI fungicides during the previous season. For example, management programs consisting of applications of flutriafol or myclobutanil in the prior season tended to have lower incidence of apple powdery in the following spring, presumably owing to reductions in overwintering inoculum. Despite reports of DMI resistance in other apple pathosystems, the DMI fungicide class is still relevant for the successful management of apple powdery mildew in New York State.

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Chemical Control of Powdery Mildew of Apple in Warmer Climates of Himachal Pradesh, India

Cited by 3 publications

References 0 publications

Prevalence and Epidemiology of Apple Powdery Mildew in Northwest Himalayan Region of Himachal Pradesh

Prevalence and Epidemiology of Apple Powdery Mildew in Northwest Himalayan Region of Himachal Pradesh

Kaolin-based particle film sprays reduce the incidence of pests, diseases and storage disorders and improve postharvest quality of ‘Delicious’ apples

Optimizing Use of DMI Fungicides for Management of Apple Powdery Mildew Caused by Podosphaera leucotricha in New York State

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