The drone has many advantages to spraying by hand. It reduces the costs of the laborers and saves time. This much faster than the hand pump which is very hard for the person carrying the sprayer on their shoulders. When humans handle such manual sprayers there is every chance that the pesticide is going into the lungs and body. The pump is very close to the person.  Hand spraying has caused so many deaths to the people doing the spraying.  The drone is a new technology we are using that is remotely operated by a technician, the humans are not near to the drone sprayer and no one is exposed to the chemicals. This is faster and much cheaper to the farmer comparing to costs paid to the laborers.