Watch growth potential

As temperatures drop moving toward winter, systemic fungicides and fertilizers are less likely to be transported up from the roots into leaf tissue due to low evapotranspiration rates. For this reason, keep an eye on average temperature and growth potential (GP). Once the GP drops to 20% and average air temperture drops below 10 C (50 F), it is unlikely that systemic products and fertilizers will be effectively taken up by the plant. Of course, surface applied contact fungicides will…