I have a very different approach when it comes to fighting pests. I believe, if your plants are healthy, they have a strong resistance towards pests. However if you have NOT been regular with adding your compost, the plants turn weak due to reduced supply of nutrients; thereby having a lower immunity which makes them vulnerable to attacks by Pests.
So the Golden rule is to keep your plant healthy with regular supply of compost. I believe in curing the infected plant by giving plants additional dose of Compost.
Rule No.2 says don’t have same plants besides each other. Different plants attract different pests. So if the same plants are not positioned next to each other, there is a very rare chance of spreading the pests. So only one of the plant gets infected.
Rule No 3: Wait patiently for the plant to fight the pest on its own. Human intervention is not always required.
Rule No 4: Take special care during change of season. Plants are mostly attacked by pests when there is a change of season. So in the last month of a particular season, add generous quantity of compost than you usually do. This enables plants to fight the stress caused by the changing season and the pests.
Rule No 5: In case you want to use any pesticide, use an organic one! Cow urine, Neem Extract and Sour Buttermilk are great pesticides!!