Bullishness of Solanaceous Crops
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Bullishness is generally caused by excessive nitrogen fertilization resulting in overly “bullish” vegetative growth. Typical symptoms include a curling and distortion of leaves near the top of the plant. In some cases, it may resemble growth regulator injury. Poor fruit set is also associated with bullishness. It is more common during periods of cool, cloudy weather. Determinate, field-type varieties seem more affected than indeterminate varieties. Bullishness is common in greenhouse or high tunnel grown plants, particularly in late winter. Plants usually grow out of the condition once light levels and temperatures increase. Reduce nitrogen fertilization during periods of cool, cloudy weather to prevent bullish growth.
Bullishness in tomato.
(Photo: UK Vegetable IPM Team)
