Diseases

Phytophthora

Description: Moist soils and warm soil temperatures favour the disease. It attacks woody ornamentals and symptoms include wilting, stunting, leaf drop, smaller leaf size, red streaking up stem wood, reddish-brown discolouration of roots and ultimately plant death.

Control: Apply Banrot.
Banrot 80G: 300g/m³ soil or 2-4kg/100m² Banrot 400WP: 60g/m³ soil or 400-800g/100m² in approx. 1000L water.

Note: It is often very difficult to diagnose a fungal disease without culturing the pathogen. Therefore it is a good idea to use a broad-spectrum fungicide such as Banrot that will treat many diseases.

Pythium

Description: Can affect both potted and in-ground seedlings. Pythium is more often a problem when drainage is poor and temperature is not favourable for root growth. It is initially characterised by rot of the small feeder roots. Plants often wilt and older foliage turns yellow.

Control: Apply Banrot.
Banrot 80G: 300g/m³ soil or 2-4kg/100m²
Banrot 400WP: 60g/m³ soil or 400-800g/100m² in approx. 1000L water.

Rhizoctonia

Description: Can cause root, stem and foliar disease of herbaceous and woody ornamentals. Symptoms include brown irregular shaped spots on foliage; sometimes web-like brown mycelium can be seen. Brown cankers looking sunken and dry can occur at soil level. Roots become brown and mushy and disintegrate.

Control: Apply Banrot.
Banrot 80G: 300g/m³ soil or 2-4kg/100m² Banrot 400WP: 60g/m³ soil or 400-800g/100m² in approx. 1000L water.

Thielaviopsis (Chalara)

Description: Also called black root rot after one of the major symptoms. Plants are stunted and rotted and display nutrient deficient symptoms. Stems below the ground may enlarge and develop rough, longitudinal cracks. Pansies appear to be particularly susceptible. Thiophanate-methyl is very active against this fungus.

Control: Apply Banrot Banrot 80G: 300g/m³ soil or 2-4kg/100m² Banrot 400WP: 60g/m³ soil or 400-800g/100m² in approx. 1000L water.