The existing Apron Blue Tag is still available for those who elect a lower treatment rate. According to William Cook of the Penn. State Seed Lab, this list is not even complete as new varieties are constantly being released. While some parts of the country easily exceed this amount, timing is not always the best. Times of insufficient moisture results in wilting and dormancy.
Excess moisture can bring about disease pressure.
Even periodic wetting and drying can be unfavorable, bringing about diseases such as leaf spot. Oh, don t forget about mowing height and temperature. The shorter the time the grass is wet, the less the disease problem. The infection of a plant by a fungal pathogen requires spore germination and development before tissue penetration can occur. The requirement of leaf wetness for these processes to occur in part explains the reason why leaf-spot is more serious in lawns on the north side of a building or in low areas where the turf remains moist for extended periods of time.