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Efficacy of Fungicides in Controlling Powdery Mildew of Pumpkin

R. Momotaz
Plant Pathology Division, BARI

A. Ayub
Plant Pathology Division, BARI

M.Arifunnaher
Plant Pathology Division, BARI

K.M.Alam
Plant Pathology Division, BARI

M. A. Rahman
Plant Pathology Division, BARI

Abstract/ Executive Summary:

Efficacy of seven new fungicides, viz., Sulphur group (Polovit 80WP2g/l, Winsul 80WP2g/l, Linksul 80 WP2g/l, Ramvit 80 WP2g/l, Univit 80 WP2g/l), Mancozeb group (Mancozide 80 WP0.5g/l), Carbendazim group (Jear 50WP2g/l) was sudied to control powdery mildew of Pumpkin in Gazipur during 2013-14 cropping season. Polovit 80 WP reduced the mildew severity (64.67 %) and increased yield of pumpkin under field condition.

Keywords: Fungicides, Powdery mildew, Pumpkin

Location:

Start Date: 00-00-2013

End Date: 00-00-2014

Program Area: Pest Management

Commodity: Diseases, Sweet gourd

Objectives:

The present investigation was undertaken to evaluate some new fungicides to control powdery mildew of Pumpkin

Methodology:

A field experiment was conducted with seven fungicides such as Sulphur group (Polovit 80WP2g/l, Winsul 80WP2g/l, Linksul 80 WP2g/l, Ramvit 80 WP2g/l, Univit 80 WP2g/l), Mancozeb group (Mancozide 80 WP0.5g/l), Carbendazim group (Jear 50WP2g/l) and untreated control (only water spray). It was laid out in Randomized complete block design having three replications during the rabi season of 2013-14. Local variety was shown in 4×4 m²plots maintaining pits size 50×50×45 cm. The first spray was given at first appear of the disease. Three sprays were applied at 10 days intervals. Assessment of diseases severity for PM was recorded seven days after the last spray and the percent diseases index was calculated by Khrishna Prasad et al. (1979) as follows:

PDI = ( ∑ Class rating × Class frequency/(Total no of leaves graded × Maximum rating scale) × 100

The data on diseases incidence of powdery mildew of Pumpkin could be rated following a 0-4 scale (Husain and Akram 1999), where 0= healthy or no infection (R), 1= slight infection, fine coating of powdery growth on upper leaves , stem free from powdery mass (MR), 2= moderately infection ,nearly 50% plant is covered powdery mass, stem also infected (MS), 3= nearly 50% leaves infected, whole plants is covered with powdery mass, stem also infected (S) and 4= all leaves as well as stem and other parts coated with thick powdery mass, leaf colour changes to grayish and starts drying (HS). Intercultural operation and fertilization was done as before.following BARC guide. Data were analyzed using MSTAT

Source of Information: Annual Research Report, Plant Pathology Division, BARI--2013-14

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Results showed that all the fungicides significantly reduced the PDI value over control. The fungicides like Winsul 80 WP but Winsul 80WP, Ramvit 80 WP, Jear 50WP gave statistically similar result. On the other hand, Polovit 80WP, Linksul 80 WP, Univit 80 WP, Mancozide 80 WP gave significantly reduced PDI value of the disease. The 64.67 % reduction of PDI of powdery mildew of pumkin was found by Polovit 80 WP followed by Univit 80 WP (63.39%). The yield of pumpkin 95.8 kg, 88.1 kg 73.9 kg ,72.7 kg was recorded from Polovit 80 WP, Univit 80 WP, Mancozide 80 WP, Linksul 80 WP treated plots respectively.

It may be concluded that the Polovit 80 WP, Univit 80 WP, Linksul 80 WP and Mancozide 80 WP could reduce the powdery mildew and increase the yield of pumpkin. So Polovit 80 WP is considered to be the best fungicide in this study.

Knowledge Management: Report/Proceedings