Tuesday, June 15, 2010
A comment/question came in about strange rot on leaves of chard. I am going to take a stab at it being leaf miners because it is now their time to show up. They make leaf tissue into greyish almost clear area where the worms eat their way out to become flies which then go and plant eggs on other leaves and repeat. Look for white eggs in tiny clusters on the undersides of the leaves of the tender leaf crops like beets, chard, and spinach. The flies can be seen hovering over the crop during the day sometimes. Neem is a wonderful preventative, but washing the eggs off is mandatory to prevent the worms hatching and eating the leaf tissue, or pick the big leafs off, wash and have a salad. then spray with Neem for the next crop. Blue sticky traps set here and there on wood sticks will catch any flies if they are really bad. If this not your problem, tell me some more about how the rot looks, i.e. slimey, curled leaves, black, etc. and we can go for a new diagnosis.