Kale aphids are grey to green in colour with a waxy coat almost adapting the colour of kales. The waxy coat is key in differentiating the aphid from other pests. The pest forms a dense population on the leaf surface(colony).
The disease, caused by a fungus (Alternaria brassicae), can cause serious losses in kales.
This disease is caused by a bacterium (Pectobacterium carotovorum) which is left in the soil as a result of decaying dead plants.
Tomato blight is classified into two types: early tomato blight and late tomato blight. All of this is manageable through natural means.
Sweet potatoes weevils resemble an ant, has an antenna which is usually differentiated by the gender of the weevil, the females have club-shaped antennae while the males are straight.
It is therefore important for countries to relook into factor that have led to low productivity for instance land degradation and population pressure on land. These calls for more sustainable farming systems.