It's also helpful to examine plants that you buy for blemishes, yellow or wilted leaves, or stunting. If you discover diseased plants in your garden, pull them up and burn them or throw them away. Never place them in your compost pile. Correct this deficiency by watering seedlings either before or after transplanting with a solution of 1.5 ounce of sodium molybdate in 5 quarts of water. The addition of lime to the soil improves the absorption of molybdate.
Downy mildew is also a condition to watch for in moist, cool areas.
If this is a problem see that the plant is well aerated and that there is maximum sunlight.