I keep right on spraying even when it gets really hot; but will tend to wait til after dark sometimes or even right at daylight to get the maximum cooling. It is fine to spray with no signs of disease but on young plants I would go with a slightly milder mix until you see some disease evidence. During long rainy spells when I am having rain every day I have a time or two sprayed every day for 4 or 5 days in a row and have frequently sprayed two or three times a week if I am fighting a particularly nasty disease or during frequent rains.
Bill
|