How aphids damage fennel farming?

Aphids can damage fennel farming by feeding on the sap of fennel plants, causing stunted growth and wilting. They also secrete a sticky substance known as honeydew, which can promote the growth of sooty mold and attract other pests. 

In severe infestations, aphids can weaken the plants and reduce crop yields. To prevent aphid damage in fennel farming, spray dimethoate 30 EC @ 10 ml per 10 lit of water on 50 percent plants having flowering.The higher activity of honeybees is observed during 12 noon to up to 4.00 evening and hence avoid the spraying during this period.