Greetings
        I am familiar with the theory and research done on screened bottoms. I read with interest the comments on what screens *do not do*. (They don't cut down on production, increase winter kill, etc.) But nobody said what they do. What is their effect in a *real world* situation and how do we know if this effect is due to the screens? Have they made possiblen any other changes in management technique? Comments?

PB