Which of the following is listed as a factor limiting bud fruitfulness besides low temp and shading?

• A. Pest pressure
• B. Nutrient deficiency
• C. Excess sunlight
• D. Water stress

Answer: (B)

Bud fruitfulness describes the vine’s ability to form flower buds for the next season, and it relies on having enough energy reserves and the right nutrient support to initiate and develop those buds. When nutrients are lacking, the vine cannot sustain the metabolic processes needed for flowering, so bud initiation is limited even if temperature and light conditions would otherwise permit it. Adequate nutrients enable key processes like carbohydrate production and transport, hormone signaling, and the formation of the structures that become flower buds; deficiencies disrupt these processes, reducing the number of buds that form. While pest pressure, excess sunlight, and water stress can affect vine health and yield, nutrient deficiency is the factor that most directly limits the ability to initiate flower buds beyond the effects of low temperature and shading.