another great product besides superthrive in a new product called MESSENGER.

I have tried it and it works wonders!

http://gardening.about.com/od/garden.../Messenger.htm

Messenger®, marketed as a plant health activator, is a discovery that was almost stumbled on by accident. Researchers at Cornell University were studying fire blight in apples and pears when they discovered that the harpin proteins being produced as a kind of by-product of the disease, were triggering an early warning mechanism in the plant being attacked, causing it to activate its own defense responses. Messenger is a topical application of harpin protein that produces the same effect in plants. However Messenger is not a pathogen and does not hurt the plant. The plant doesn’t realize it is not being attacked, it just senses harpin proteins and is tricked into responding. The response is 3-fold:
The immune response genes are spurred into action

A growth response is triggered and the plant begins photosynthesizing at a higher level

The reproductive inclination is revved and the plant begins producing more blossoms

According to Jeff McClellan, a Market Manager for Home and Garden at EDEN Bioscience , none of these reactions appear detrimental to the plant. Messenger is applied to the surface of the plant. It is not genetic or systemic. Messenger is non-toxic and breaks down quickly. In fact, since it is a protein, it is a food source.

Messenger is labeled as a bio-pesticide, but Eden Bioscience prefers to refer to it as a Plant Health Regulator. Treated plants will be less disease prone and better able to withstand disease and stress.