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- Title
Modelling the relationship between purple blotch and yield loss in garlic and effect of leaf damage on bulb yield.
- Authors
BISHT, I S; AGRAWAL, R C
- Abstract
Summary An AUDPC model was developed to describe the relationship between Alternaria porri infection and yield loss in garlic. Percentage yield loss was regressed against AUDPC and gave an acceptable fit to a linear model with an intercept of -0.35, a slope of 0.09 and R2= 0.85 during 1990-91 and an intercept of 1.91, a slope of 0.08 and R2= 0.87 during 1991-92. The effect of various levels of leaf damage on garlic bulb yield was also studied to simulate damage caused by A. porri. Significant yield reduction by 25% defoliation at 5 wk, 50% defoliation at 4 wk and 75% defoliation at 3 wk before bulb maturity were recorded. No significant yield reduction from 2 wk before bulb maturity could, however, be noticed even at the highest levels of leaf damage. Linear regression models were fitted for predicting yield at various levels of defoliation at different weeks before bulb maturity. These models can be used to describe the consequences of disease epidemics, projecting possible losses during the season and justifying the need for chemical disease control.
- Publication
Annals of Applied Biology, 1994, Vol 125, Issue 2, p293
- ISSN
0003-4746
- Publication type
Article
- DOI
10.1111/j.1744-7348.1994.tb04970.x