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Genetic & biochemical management of Alternaria leaf spot disease of cabbage and cauliflower


The International Journal of Biological Research (TIJOBR)

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Amar Ahmed Khan1*, M. Tamoor Hassan Khan2, Iqra Kanwal1, Anam Nazir3, Amer Habib1, Faisal Imran4

Department of Plant Pathology, University of Agriculture, Faisalabad, Pakistan.

2Institute of Horticultural Sciences, University of Agriculture, Faisalabad, Pakistan.

Department of Botany, University of Agriculture, Faisalabad, Pakistan.

4Institute of Agricultural Extension and Rural Development, University of Agriculture, Faisalabad, Pakistan.

*Corresponding author email: amarkhan4555@gmail.com 

Submitted Accepted Published
Oct 27,2019 Dec 26,2019 Jan 12,2020

2020 / Vol: 3 / Issue: 1


Abstract


Cabbage and cauliflower are important vegetables throughout the world due to its nutritional value. Alternaria leaf spot is an important disease which damages its leave and deteriorate the quality as well as quantity of the vegetables. The investigation was performed in the experimental area of Department of plant pathology, UAF. Fifteen (15) cabbage and cauliflower cultivars i.e.  Bok Choy, Savoy cabbage, Choy sum, Napa cabbage, Cannonball Cabbage, Red Cabbage, King cabbage, Cheddar, Romanesco, Purple of Sicily, Snowball y, Pusa Deepali, Orange cauliflower, Purple cauliflower and White brought from AARI   (Ayub Agricultural Research Institute) was planted under RCBD with symmetry as 40cm×70cm @ three duplications of each variety. All 8 fungicides done well compare to control. Between all Mancozeb Capably minimized the D.I up to (24.098%) and cresc exact to (34.702%) as compared to control. Curzate, Raydar, Score, Chlorostrobin, Success and Cytrol reduced the disease as well. Treatment with concentration interactions proved that 0.50% concentration of Swing showed less disease incidence as paralleled to 0.25% concentration disease. While comparing to Control previous concentration gave higher and actual findings. Antracol @ 0.5% decreased it to (30.594%) and control gave (66.001%) D.I. All fungicides displayed progressively growing disease incidence while comparing at (0.25%) of Cresc, Curzate, Raydar and Cytrol at initial application and was higher at second spray. Swing and Antracol actively lessened the disease up to (29. % on Pusa Deepali and 19.028%, of cheddar. Treatment ×weeks proved that spraying @14 days’ interval Swing expressed minimum disease followed by Antracol which displays a little opposing outcome with slowly greater disease incidence (36.035%) after fourteen days whereas after 7 days it was 33.373%. Cytrol showed higher disease (45.677%) followed by Raydar, cresc and mancozeb. while after 14 days’ interval extreme incidence was also showed by Cytrol application (42.747%) followed by Raydar (42.390%), Score (40.855%). (68.701) and (63.301%) was given by control. It can also be incidental swing is active in suppression of disease. Treatments× varieties× concentration resulted efficacy of concentrations compared to control. 15.898% was seen with 0.5% concentration on Cheddar and (28.336%) on Pusa Deepali. Correspondingly, application of 0.25% gave which is 30% and 22.158% respectively. Application of score (46.637%) @ 0.25 % followed by mancozeb (44.90%) and Cytrol (43.061%) while after 2nd concentration maximum disease incidence was expressed by score followed by Raydar and mancozeb (47.335%, 46.350 and 43.640%) respectively on Cheddar. Every concentration of Swing at 7 days’ interval and 14 days’ interval controlled the disease. The disease incidence noted afterward seven days was 26.466% and 24.383% and 25.693% and 19.851 % after 1fortnightly spray @ concentrations. Disease incidences are: Cytrol (43.797%) followed mancozeb (42.322%) and Score (40.514%) 0.5%. Interface of treatment× week’s ×varieties showed leases disease incidence by Swing on Cheddar (18.566%) and on Pusa Deepali (32.280%) after first week while 26.054% and 19.487% after second week. Cytrol on Pusa Deepali (47.389) gave highest D.I and by Score on Cheddar (47.888%) within seven days’ interval.  At fortnightly inspection Cresc and Cytrol showed extreme disease incidence (46.133% and 45.106%) but on Cheddar Score, Raydar and mancozeb verified extreme disease incidence of (46.088%5, 44.891% and 43.282%). Control gave 68.701% and 63.301% disease incidence. All other chemicals showed somewhat a reduced amount of disease incidence as associated to previous mentions. Gradual lessening measure was saw on Pusa Deepali and Cheddar afterward the use of both concentration with systematic interval of seven days and fourteen days with infection incidence of 32.952%, 31.606%, 19.976%, 17,156%, 27.046%, and 25.062% respectively.  Swing (0.50%) exhibited 22.118% incidence inhibition in contrast with 0.25% concentration which gave 26.079% inhibition. In Control plants earlier conc. represented effective result than later one. Antracol 0.5% conc. reduced the disease up to 0.594% as compared to control which showed 66.001% results. Inference was developed from these results that these fungicidal strengths are effective in disease suppression up to 50%. It also been revealed that @0.25% mancozeb and Score are alike in results as they provided 41.422% and 40.766% disease incidences individually. Slight change can be detected with 0.5% concentrations of both as it provided 37.918% & 39.802% results.

Key words: Alternaria leaf spot, cabbage, cauliflower


Reference


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