Therefore, fast degradable and environment friendly herbicide technology and weed management strategies are being recommended for sustainable agriculture.

Microbial toxins, therefore, are being manipulated to produced commercial herbicides.
Following are some of the biotechnology evolved products, which can be effectively used in weed management, particularly in India:
(i) Bioherbicides derived from biological systems can be used for weed control. One of the examples is ‘collago’ for rice weed control.
(ii) Naturally occurring herbicides like ‘phosphinothricin’ (Basta) to control weed grasses and other broad leaf weeds have also been developed.
(iii) synthetic analogs of microbial toxins can be also be used to control weeds. For instance, ‘methoxyphenon’ a synthetic analog of the microbial toxin ‘anisomycin’ has been developed to control barnyard grass in rice.

The above are some examples of herbicides, which will be environmentally safe. To allow the use of these herbicides for crop protection programme, genetically engineered herbicide resistance plant have been produced in a number of crops, which should eventually allow the use of environmentally safer herbicides. These plants have been field tested and are being grown in different plant of the world.

Use of a variety of different combinations of herbicides in rotation has also been recommended to prevent (i) shift of weed flora and (ii) development of resistant biotypes of weed species. Alternative techniques like development of biological control and genetic engineering are also being utilized for weed management.