Pruning tomatoes is an essential activity during the maintenance of the tomato crop. Just as the plants should be trellised every week, so should each tomato plant be pruned in order to obtain maximum yields. Pruning tomatoes ensures that the energy is used in developing fruit and the main stem. [...]
Trellising tomato plants is only required when growing indeterminate types in greenhouses. Although trellising tomato plants it is labour intensive and must be done weekly, the advantages far outweigh disadvantages. Trellising tomato plants has the following advantages: It increases yield per square meter Reduces the risk of disease development Improves [...]
Severe zippering with secondary scarring of the tomato skin. Zippering symptoms Zippering are thin scars running from the top of the shoulder of the fruit down the length to the blossom end. These longitudinal scars have small transverse scars along it, which resemble a “zip” (thus the name). [...]
Tomatoes originated in tropical America. Tomatoes were first exported from Peru to Italy, then to Northern Europe and finally to the USA by 1781. In 1812 tomatoes were a common sight on markets and in 1817 the first seed was offered for sale in a seed catalogue. After 1817, various [...]
Blossom drop Symptoms Blossom drop (flower buds abscise) occurs prior to anthesis under stress conditions. The early indications of blossom drop are the yellowing of the swollen area which joins the flower to its stem. After the flower has fallen or abscised, a small dried out stub is left over. Which [...]
Blossom-end-rot (BER) Symptoms This physiological disorder looks like a typical fruit disease. The symptoms generally occur at the blossom-end of the fruit and begins with a light tan, water soaked lesions, which when enlarged, turn black and leathery. As in tomatoes and watermelons, blossom-end-rot usually appears when the fruit is about [...]
Sunscald or sunburn causes Sunscald may appear on foliage and fruits. The disorder is caused when the temperature of the fruit exceeds 40°C. An imbalance of various chemicals takes place which causes the destruction of the tissue. Heat injury expresses itself through a narrowing of the base of the stem, at [...]
At some stage a grower will see thin spindly pale plants growing somewhere in the greenhouse. Although not a physiological disorder of fruit, it is a disorder of the plant as a whole. Quite often plants grow to become long and stretched out. The leaves may even be smaller than [...]
Getting small fruit (peppers or tomatoes) is better than getting no fruit at all. However it can be frustrating when growing to achieve 140 g fruit and harvesting 60-80 g instead. Small pepper fruit can be the result of various factors such as: Poor pollination: the temperature may be too [...]
