The tomato. Although this is botanically a fruit, it is always considered to be a vegetable in culinary and horticultural terms. It is probably the second most important vegetable after potatoes. The cultivated tomato is a self-pollinating, annual plant. It is plagued with parasite, largely because of low levels of horizontal resistance resulting from a century of the vertifolia effect. Much breeding has taken place in the past, but there has tended to be a very rapid turnover of cultivars because of the use of vertical resistance.
With the spread of the A2 mating type of blight (Phytophthora infestans) in the northern hemisphere, tomatoes have become more difficult to cultivate. When there was only the A1 blight, functional oospores could not be produced, and the only way in which blight could survive the winter was in potato tubers. This meant that tomatoes could get blight only from potatoes, and only rather late in the season. However, with functional oospores in the soil, tomatoes now get blight much earlier, and much more severely.
Organic gardeners can avoid blight be putting a temporary, transparent, plastic sheet roof over the tomatoes to ensure that the leaves and stems never get wet. Blight spores need free water on the leaves in order to infect. The plants must then be given furrow irrigation.
Tomatoes are a very promising crop for amateur breeders working for improved horizontal resistances by using recurrent mass selection .
Was this article helpful?
Interested In Canning Juicy Tomatoes? Here's How You Can Prepare Canned Tomatoes At Home. A Comprehensive Guide On Tomato Canning. The process of canning tomatoes at home has been a family tradition with many generations. Making home canned or home tinned tomatoes is something that is remembered by families for years! You must have surely seen your granny canning tomatoes at home in order to prepare for the approaching winters. In winters, one is usually unsure of getting fresh tomatoes.