Bunch Stem Necrosis – What Is It And What Can Be Done About It

Bunch Stem Necrosis (BSN) has a severe impact in certain viticulture regions in New Zealand. Environmental conditions are difficult to have control over, water and drought stress may be controlled via irrigation, and it has long been the belief of some consultants that proper Balanced Nutrition plays an important role in alleviating the disorder.

Roots Shoots & Fruits Ltd. in conjunction with a leading corporate studied the impact of balanced nutrition on a block of BSN affected grapes in the Hawkes Bay Region over two seasons.

The first season looked at whether a foliar Potassium fertilizer K-Forte (0-5-20) had any detrimental effect on BSN and the second year looked at a nutritional balanced fertilizer program on the effects of BSN. The results show that the Incidence of BSN was reduced by 32.66%, severity was reduced by 5.79% and the overall total infection reduced by 37.37%.

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