BIO-HERBICIDES: DEVELOPMENT, USE AND ELUCIDATION OF THE FACTORS AFFECTING THEIR EFFICACY

Weeds belong to diverse groups of exotic and native grass species are considered problematic for significant crops such as Cyperus rotundus or Dhela; Avena fatua Jungli Jai one the most dangerous weeds wheat around world. The agricultural product loss recorded in Pakistan due estimated a 17-25% yield weeds, 20-45% maize, 13-41% cotton, 20-63% rice, 10-35% highest sugarcane, 25-55% pulses. Many inhibit growth other plants with their allelopathic effects through release specific inhibiting substances topsoil. Several provide them alternate host various types insects, pathogenic fungi, bacteria, viruses that may attack crop. To meet food demand increasing population upcoming years is big challenge Pakistan. first use biological control was reported 1971, used called bio-herbicide. It eco-friendly, safe non-targeted organisms, practically easy use, not involved health-related risks humans animals. This review tried explain role bio-herbicides weeds.