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Effect of Bion and Amistar in Inducing Resistance Against Cercospora Leaf Spot of Banana

Fahmida Akter
Department of Plant Pathology, Faculty of Agriculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Md. Mijanur Rahman Mejan
Department of Plant Pathology, Faculty of Agriculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Mst. Arjina Akter
Department of Plant Pathology, Faculty of Agriculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Ismail Hossain
Department of Plant Pathology, Faculty of Agriculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

Bion (benzothiadiazole) and Amistar (azoxystrobin) were applied for controlling Cercospora leaf spot of banana variety Amrita Sagarin at the field laboratory, Department of Plant Pathology, Bangladesh Agricultural University (BAU), Mymensingh by applying different treatments viz. dipping bottom of sucker for 6 hrs. in Bion (0.005%) before planting, dipping bottom of sucker for 6 hrs. in Bion (0.01%) before planting, spraying of Bion @ 0.005% once on leaves after 80 days of planting, spraying of Bion @ 0.01% once on leaves after 80 days of planting, spraying of Amistar @ 0.05% once on leaves after 80 days of planting, spraying of Amistar @ 0.05% only on leaves after 80 and 140 days of planting, spraying of Bion @ 0.005%) once on leaves and pseudostem after 80 days of planting, spraying of Bion @ 0.01% once on leaves and pseudostem after 80 days of planting and control (without chemical). From these above treatments it is revealed that dipping of bottom of banana sucker for 6 hrs. in Bion either @ 0.005% or 0.01% significantly reduced plant height, while Bion and Amistar did not exert any effect on number of leaf/ plant. Bion @ 0.005% and 0.01% (dipping of bottom of sucker before planting), Bion @ 0.01% (on leaves, 1 spray) and 0.01% (on leaves and pseudostem, 1 spray) and Amistar @ 0.05% (on leaves, 2 spray) showed significant effect in reducing number of diseased leaf/ plant, number of diseased spot/ plant, percent leaf area (cm2) diseased/ plant, mean spot size (mm²)/ plant of banana var. Amrita sagar.

Keywords: Banana; Induce Resistance; Leaf spot; Bion, Amistar

Location: In the field laboratory, Department of Plant Pathology, Bangladesh Agricultural University (BAU), Mymensingh

Start Date:

End Date:

Program Area: Pest Management

Commodity: Diseases, Banana

Objectives:

The study was undertaken to evaluate Bion and Amisterin inducing resistance to banana plant against Cercospora (sigatoka) leaf spot.

Methodology:

The experiment was carried out in the field laboratory, Department of Plant Pathology, Bangladesh Agricultural University (BAU), Mymensingh, Bangladesh. Sword suckers of banana variety viz.Amrita Sagarwere collected from Boira union, Sadarupazilla, Mymensingh, Bangladesh. Three weeks before planting, pits of 0.60 m diameter and 0.40 m depth were prepared by digging the soil with spade (Haque, 1988). After one week of pit preparation with manures and fertilizers, uniform sized selected rhizomes of banana variety viz. The rhizome in a pit was covered by about 10 cm soil and the soil around it was pressed firmly. There were two chemicals namely Bion (benzothiadiazole), an inducer of resistance and Amistar (azoxystrobin), a fungicide was used in this experiment. The treatments were:T1 = Dipping bottom of sucker for 6 hrs in Bion (0.005%) before planting, T2 = Dipping bottom of sucker for 6 hrs in Bion (0.01%) before planting, T3 = Spraying Bion (0.005%) once only on leaves after 80 days of planting, T4 = Spraying Bion (0.01%) once only on leaves after 80 days of planting, T5 = Spraying Amistar (0.05%) once only on leaves after 80 days of planting, T6 = Spraying Amistar (0.05%) only on leaves after 80 and 140 days of planting, T7 = Spraying Bion (0.005%) once on leaves and pseudo stem after 80 days of planting, T8 = Spraying Bion (0.01%) once on leaves and pseudo stem after 80 days of planting and T9 = Control (without chemical). Each spray solution was prepared by mixing definite amount of chemicals with tap water and the bottom of suckers carefully treated. In case of single spray, Amistar (0.05%), Bion (0.005% and 0.01%) were sprayed at 80 days after planting. The second spray of Amistar (0.05%) was done at 140 days after planting.The experimental plots were inspected at 15 days interval for the appearance of Cercospora (sigatoka) leaf spot. The data on the following parameters were considered for collection: i). Plant height (cm), ii). Number of leaves per plant, iii) Number of sucker per plant, iv) Healthy and diseased sucker per plant, v) Percent leaf area diseased per sucker, vi) Mean spot size per main plant. The experiment was carried out in Randomized Completely BlockDesign (RCBD) with three replications. Eachreplication contains four banana plants.

Source of Information: J Bangladesh Agril Univ 16(3): 380–385, 2018 ISSN 1810-3030 (Print) 2408-8684 (Online)

Article Link (Online Journal): https://doi.org/10.3329/jbau.v16i3.39403

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

It is concluded that banana infected by Cercospora leaf spot (sigatoka) (Cercospora musae) may be successfully controlled by Bion or Amistar. Bion (inducer of
resistance) and Amistar (new fungicide) can be advocated to our farmers for controlling Cercospora leaf spot (sigatoka) of banana.

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