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Chemical Controlling Powdery Mildew of Pumpkin

R. Momotaz
Plant Pathology Division, BARI, Gazipur

Abstract/ Executive Summary:

Efficacy of ten new fungicides , viz., T₁= Select one 72% (Mancozeb 64%+ Cymoxanil 8%WP), T₂= Agister35 SC(Azoxystribin 20%+Difenoconazol 15%), T₃ = Antivo75WDG (Tebuconazol 50%+ Trifloxystrobin 25%), T₄= Pesticide 32SC(Azoxystrobin20% + Difenoconazol 12.5%, T₅= Hundred 35SC(Azoxystrobin20% + Tebuconazole 15%, T₆= Tahoe27 SC(Thifluzamide 9% Tebuconazole 18 %, T₇ = Armada 35SC (Epoxiconazole 30% + Azoxystrobin5% T₈= Campride-3WP(Carbendazim 10% + Metalaxyl 10%+ Imidaclopride 10% WP, T₉ =Amocozole plus-25 SC( Hexaconazole 3%+ Tricyclazole 22% ), T₁₀= Conza plus10SC(Hexaconazole 3% ) were tested to control of Powdery mildew of Pumpkin. Agister35 SC (86.81 %) and Antivo75WDG (83.85 %) reduce the Powdery mildew over control and increase the yield of pumpkin. So, Agister35 SC and Antivo75WDG are the better fungicides to reduce the Powdery mildew than the other fungicides

Keywords: Chemical, Fungicide, Pumpkin

Location: A field experiment was conducted in the field of Plant Pathology Division, BARI, Gazipur

Start Date: 00-00-2018

End Date: 00-00-2019

Program Area: Pest Management

Commodity: Diseases, Sweet gourd

Objectives:

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

Methodology:

A field experiment was conducted in the field of Plant Pathology Division, BARI during the Rabi season of 2018-19. The experiment was laid out in Randomized Block Design with three replications. The treatments consisted of ten fungicides viz. T₁= Select one 72% (Mancozeb 64%+ Cymoxanil 8%WP), T₂= Agister35 SC(Azoxystribin 20%+Difenoconazol 15%), T₃ = Antivo75WDG (Tebuconazol 50%+ Trifloxystrobin 25%), T₄= Pesticide 32SC(Azoxystrobin20% + Difenoconazol 12.5%, T₅= Hundred 35SC(Azoxystrobin20% + Tebuconazole 15%, T₆= Tahoe27 SC(Thifluzamide 9% Tebuconazole 18 %, T₇ = Armada 35SC (Epoxiconazole 30% + Azoxystrobin5% T₈= Campride-3WP(Carbendazim 10% + Metalaxyl 10%+ Imidaclopride 10% WP, T₉ =Amocozole plus-25 SC( Hexaconazole 3%+ Tricyclazole 22% ), T₁₀= Conza plus10SC(Hexaconazole 3% ) and T₁₁= control (only water spray ). The variety BARI mistikumra -2 was shown in 3×3 m²plots maintaining pits size 50×50×45 cm.The first spray was given at first disease appearance. In total, three sprays were applied at 9 days intervals. Assessment of diseases severity for Powdery mildew was recorded at seven days after the last spray and the percent diseases index was calculated by Khrishna Prasad et al. (1979) as follows

∑ Class rating × Class frequency

PDI = × 100

Total no of leaves graded × Maximum rating scale

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, a fine coating of powdery growth on upper leaves, stem free from the powdery mass (MR), 2= moderately infection ,nearly 50% plant is covered powdery mass, the 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 greyish and starts drying (HS). Intercultural operation and fertilization were done as before. Data were analyzed using R software program to compare the means for all phases of the Experiment

Source of Information: Annual Research Report 2018-19, Plant Pathology Division, BARI, Gazipur

Article Link (Online Journal):

Funding Source:

1.

Budget:

Total Budget (Tk.) :

Achievement/Findings:

All the tested fungicides significantly reduced the disease and increase the number of fruits per plant and yield of Pumpkin compared to control (Table 1). The lowest percentage diseases index (2.72) was recorded in the sprayed plot of Agister35 SC which is belonged to the group of (Azoxystribin 20%+Difenoconazol 15%) and it was followed by Antivo75WDG (3.33) (Tebuconazol 50%+ Trifloxystrobin 25%) groups. The highest PDI (20.63) was observed in the control plot. Moreover, disease reduction ranges from 45.12 % to 86.81 %, while the lowest disease reduction was recorded from T₈(Campride-3WP) treatment and the highest disease reduction was obtained from T₂ (Agister35 SC) over the control treatment.

Results on the effect of fungicides on growth parameters of Pumpkin are presented in Table 2. Among the ten fungicides, application of six fungicides viz. Agister35 SC, Antivo75WDG, Select one 72%, Campride-3WP, Amocozole plus-25 SC and Tahoe27 SC gave a higher number of branches per plant which is significantly different from other treatments. All the fungicides differ from the number of fruits, weight (kg) of fruits per plot. Agister35 SC resulted from the highest (35) number of fruits/ plant followed by Antivo75WDG (30) treated plot. The yield of fruits varied from 13.18 t/ha to 25.18 t/ha, where the highest was recorded from Agister35 SC and the lowest was recorded from the control treatment

Knowledge Management: Report/Proceedings