In The Greenhouse: Tomato Updates

 

 

To avoid this disease in the future, look for a greenhouse variety with full resistance, indicated by a C5 in the disease resistance code. This would include many of the newer types. A C2 variety has partial resistance, so I would not recommend it.

If you still get this disease, it is almost certain that you are using an old greenhouse variety, or more likely a field or garden variety of tomato. I do understand that in some markets, heirloom or other garden varieties are in demand and therefore reward the grower with higher sales prices. If this is the case, maneb, manex, mancozeb, or dithane should help.

 

 

 

Wouldn’t it be great if you could accurately estimate your tomato yield several weeks before each cluster ripened? This would greatly facilitate marketing and sales. In studying various environmental variables and their effects on yield, a researcher in Japan has come up with a strongly positive correlation between yield and one factor: the amount of solar radiation (light) during the couple of weeks just before anthesis (fully opened flowers). Tadahisa Higashide, working at the National Agricultural Research Center for Western Region of the National Agricultural and Food Research Organization in Zentsuji, Kagawa, Japan, found that total fruit yield and fruit number could be predicted by the amount of solar radiation from four to 10 days just before anthesis. The correlations with light were stronger than those of air temperature during the period before anthesis.