Indian authorities are helping farmers mount a pesticide spraying campaign to fight the swarms of desert locusts which have already devastated crops across Pakistan and East Africa.As many as 700 tractors, 75 fire engines and almost 50 other vehicles are engaged in spraying pesticides to kill the locusts, Trilochan Mohapatra, director general of the state-run Indian Council of Agricultural Research in New Delhi said on Tuesday. Drones will also be employed.”At this point it’s manageable, but if it continues it will be a problem” for monsoon-sown crops, said Mohapatra, who’s also the top bureaucrat at the department of agricultural research and education. The impact will be lessened by the current spraying campaign and the fact that the harvest of the winter crop is mostly over, he said.