Verticillium wilt – Verticillium alboatrum – found on all vegetable crops
Verticillium wilt is caused by the fungus Verticillium alboatrum. Quite often verticillium wilt is confused with fusarium wilt. The fungus attacks a wide range of...
All posts by Antonius Lecuona
Damping-off affects almost all seedlings
Most seedlings are particularly susceptible to damping-off. In general the disease is caused by the fungi Pythium but some damage also occurs from infection from Rhizoctonia...
Bacterial wilt
Bacterial wilt known as Ralstonia solanacearum biovar 3, formerly known as Pseudomonas solanacearum (SMITH) and Burkholderia solanacearum). Bacterial Wilt also known as Southern bacterial wilt...
Bacterial canker (Clavibacter michiganensis) the most destructive disease
Bacterial canker (Clavibacter michiganensis) is one of the most destructive diseases of tomatoes which is caused by Clavibacter michiganensis subsp. michiganensis (smith) formerly known as...
Powdery mildew
Powdery mildew background Powdery mildew (Leveillula taurica) is most prevalent in warm, dry atmosphere. The optimum germinating temperature is approximately 25°C with humidity ranging between...
Early blight (Alternaria solani) common fungus on tomatoes
Early blight (Alternaria solani) is one of the most common funguses found on tomatoes. The fungus infects mainly the leaves, but stem and fruit infection...
Late blight – Phytophthora infestans
Late blight background Late blight (Phytophthora infestans) is very destructive under conditions of excessive moisture and low temperatures. Starts as small water soaked lesions which...
Botrytis rot or grey mould fungus – symptoms and control
Botrytis rot (Botrytis cinerea) Botrytis rot (Botrytis cinerea), also known as grey mould, is caused by the fungus Botrytis cinerea, and has become on the...
Bacterial speck
Bacterial speck, also known as Xanthomonas campestris pv. vesicatoria, Pseudomonas syringae pv. Tomato. Bacterial speck and spot are very difficult to distinguish from each other. However...
Cucumber pest and disease control
Never use chemical that are not registered by your local Department of Agriculture. A range of chemicals that can be used on cucumbers are provided...
The basics of growing cucumbers in hydroponic greenhouses
Establishing the cucumber crop Cucumbers are tropical plants. In order to grow optimally a tropical environment should be created. This implies that temperatures should not...
Trellising green beans in hydroponic bag culture greenhouses
Trellising green beans is actually quite easy compared to tomatoes and cucumbers. One thing is sure, you have to trellis the plant. Although it is...
Growth cracks in greenhouse vegetable fruit
Growth cracks symptoms There are two types of cracking found on tomato fruit. Concentric cracking are cracks that vary in depth and size found in...
Cat-face tomato fruit – genetic physiological disorder
Cat-face tomato fruit Symptoms Fruits have a long scar at the blossom end that extends inwards and renders the fruit unmarketable and disfigured (abnormal). There are...
Hollow fruit disorder in hydroponic greenhouse systems
Hollow fruit description Hollow fruit, also called puffy fruit or boxy fruit are angular in shape instead of round, however one should be careful since some...
