Weed survey of wheat fields conducted in 1990 and 1991 revealed predominance of grass weeds (Avena ludoviciana, Phalarisminor and Polypogon monspeliensis) in the eastern zone of Haryana where more moisture and heavy soil were prevalent, while in the western parts where soils were tight and moisture was low, there was a dominance of Chenopodium album, Asphodelus tenuifolius, Trigonella polycerata and Fumaria parviflora, Medicago denticulata, Rumex maritimus, Circium arvense, Melilotus indica and Convolvulus arvensis bad significantly more infestation in the eastern zone, whereas Sisymbrium irio, Euphorbia dracunculoides, Sapponaria vaccaria, Desmostachya bipinnata, Zizyphus rotundifolia and Aerva javanica were confined to westernzoneonly. Weed flora was more diverse in Hisar, Sirsa, Bhiwani and Rohtak districts but relative intensity of weeds was more in Kurukshetra, Kaithal, Sonepat, Ambala and Karnal districts and minimumin Mahendergarh, Sirsa, Faridabad and Bhiwani districts. C. album, Phalaris, Avena, Polypogon, Melilotus, Medicago, Anagallis arvensis, Rumex, Circium, Asphodelus, Trigonella, Convolvulus, Spergula arvensis, Fumaria, Vicia sativa and Lathyrus aphaca occurred at more than 15 per cent surveyed fields. Among these, the most competitive weeds, Avena and Phalaris were more in Sonepat, Panipat, Kurukshetra, Kamal, Yamunanagar, Kaithal, Ambala and Jind districts, whereas proportional dominance of C. album was more in Bhiwani, Gurgaon, Mahendergarh, Rewari, Rohtak and Hisar districts.