Ludhiana, Mar 18 (UNI) Punjab Agricultural University scientists, who surveyed the wheat crop in districts of Ludhiana, Moga, Mukatsar, Bathinda, Barnala, Jalandhar, Gurdaspur, Amritsar and Hoshiarpur has found moderate to high incidence of aphid in all the places.
Aphids are soft bodied, green to blackish green louse like insects found in small colonies on leaves and earhead. They suck the sap from the leaves and maturing grains.
According to the experts, the high populations of aphids at the earhead stage can cause substantial losses in yield. The damage of the aphids first starts from the periphery of the field, particularly from the side on which trees are present. Proper spray can check its further spread in field.
PAU scientists have advised the farmers to spray their crop only when five aphids per earhead are recorded from 10 randomly selected earheads in each of the four quarters of one acre.
They recommended the farmers to use 150 ml Rogor 30 EC (dimethoate) or Metasystox 25 EC (oxydementon methyl) or Nuvacron 36 SL (monocrotophos) in 80-100 litres of water per acre with knap-sack sprayer or in 30 litres of water with power sprayer. If necessary, the farmers are advised to repeat the spray after 15 days.
Meanwhile, the aphid attack has also been noticed on different fruit crops like pear, peach and citrus. In fruit crop, aphids suck the cell sap from leaves, flowers and growing tender shoots, resulting in shriveling and drying up of the plants. The aphids attacking flowers reduce the fruit set as well as shedding of flowers.
To check the incidence of these aphids, entomology head Dr N S Butter, advised the farmers to spray 160 g Actata or 200 ml Confidor or 1000 ml Metasystox in 500 litres of water on pear and citrus, while 800 ml Malathion to be sprayed on peach. Foot pump or rocking sprayer should be used for the proper coverage of the trees.
UNI PS BJR RN1947