We have a holistic approach in controlling pests and diseases in organic farming. Integrated pest management ( IPM ). We start by feeding the soil and the soil feeds the plants. A healthy crop will resist attack. Resistant varieties , time of planting , companion planting , encouraging beneficial insects such as lady birds and parasitoids ( wasps) , trap crops etc. After doing all good agricultural practices and one finds insects attack, then one can use organic concoctions made of chilli, neem tree, ashes garlic etc.
Crop rotation of different crop families must be followed. Soil health a must.