Expert Centre
Pest and disease advise

Pest & Disease Advice

The more we understand a pest of disease life cycle, the easier they are to control. Knowing at which stage your particular infestiation is will ensure you are able to target them with your crop protection programmes to ensure maximum control.

In the pages below, you will find information on all the main pests and diseases we face in East Africa when growing floriculture crops. This includes what symptoms indicate the diseases and infestations; management best practices, resistance management guides and life cycles to help you identify your issues and most importantly, find the best product for you. 


Aphids damage crops directly by distorting leaves and flowers as they feed.


Botrytis primarily attacks tender, weak, wounded or dead tissue.

Black Root Rot - Teaser

Black Root Rot

Plants are stunted and appear nutrient deficient, roots are dark brown with spots of blackened areas, yellowing of lower leaves.

Black Spot - Teaser

Black Spot

Foliage develops rapidly expanding dark purple-black spots with a feathery margin, often surrounded by chlorotic tissue; heavily affected leaves often abscise from the plant; black elongated lesions may develop on the stems.



Caterpillars feed on leaves, buds, growing points and flowers. Leaf damage reduces leaf area which can slow plant growth.

Downy Mildew

Symptoms are yellowing leaves surrounding angular areas which can vary from green islands, to purple or dark brown lesions.

Fusarium Crown & Root Rot - Teaser

Fusarium Crown & Root Rot

Leaves turn yellow and may have a scorched appearance; brown, lesions or streaks may appear on the lower part of the stem; lower stem may be girdled; rotted and discolored roots.

Leaf miner

Leaf miners are members of Diptera group like flies and mosquitoes.


The nymphs and females cause damage to host plants with their piercing-sucking mouthparts which they use to suck sap and remove nutrients.

Pythium Root & Crown Rot - Teaser

Pythium Root & Crown Rot

Infections on established plants cause lower leaves to turn yellow and defoliate; plants will wilt during the heat of the day, recovering at night.

Phytophthora Crown, Stem & Root - Teaser

Phytophthora Crown, Stem & Root

Plants begin to wilt and will not recover with additional water or cooler temperatures; the lower stem will have a dark, water-soaked lesions near the soil line; plants ultimately collapse.

Phytophthora Foliar/Aerial Blight - Teaser

Phytophthora Foliar/Aerial Blight

Irregular brown spots develop on the leaves, often starting at the leaf margin; dark brown lesions develop on the stem and petiole causing plants to wilt; white, fluffy sporulation can be observed under high infections.

Powdery Mildew

Severe mildew damage reduces leaf growth, aesthetic value of plants, photosynthetic efficiency and thereby plant growth.

Rhizoctonia Crown & Root Rot - Teaser

Rhizoctonia Crown & Root Rot

Infection causes wilting, leaf yellowing and often plant death as plants collapse

Root-Knot Nematode

They enter plant roots, cause distinct root knots and severe deformation on the roots.

Sclerotium Crown & Root Rot (Southern Blight) - Teaser

Sclerotium Crown & Root Rot (Southern Blight)

The pathogen invades through the roots and lower stem causing the lower leaves to turn yellow, followed by wilting and death of the plant


Each type of rust has its own distinctive symptoms and its own specific plant hosts. Rust symptoms are initially characterised with light green coloured lesions.

Spider Mites

Spider mites are especially abundant during dry seasons and typically colonize the under-surface of leaves.


Adults are mainly flower-feeders but will also feed on stems and leaves of plants as well.


Both adult and larvae feed on plant phloem by injecting enzymes and removing the sap, reducing vigor of the plant.