Department of Entomology, Punjab Agricultural University, Ludhiana, 141 004, Punjab
The mustard aphid, Lipaphis erysimiKalt. ls an Important pest on radish seed crop. For controlling mustard aphid on radish seed crop with rotary-disc sprayer, the optimum height of the sprayer from crop canopy is 0.5 m, and the swath width 10 m. The spraying should be carried out in the mornings or evenings.
