LAHORE - It is important to check the wheat crop on a regular basis to avoid aphid attack on it. These views were expressed by Punjab Agriculture Director General Dr M Anjum Ali in an interview to APP on Saturday. He said if growers observed an aphid attack they should shake the affected area b do not let aphids to increase, so farmers must leave the insects in wheat fields for help,” he added. Agriculture poisons should not be used on the wheat crop as it leaves harmful effects on humans and the environment.