CLP holds fourth installment to Vegetable
Herbicide Resistance Webinar series
CropLife Philippines recently concluded another successful installment of the #alaMOAba
Vegetable Herbicide Resistance Management Series. The webinar was the fourth in five events
planned to cover the topic.
During the event, Dr. Nina Gracel Dimaano, Associate Professor at the Institute of Weed
Science, Entomology and Plant Pathology of the UPLB College of Agriculture and Food Science,
held a lecture on weed management for vegetables in lowland areas.
Dr. Dimaano underscored that there is no single weed management technique that is effective
against all types of weeds, and this is why it is important to use two or more techniques to
achieve better weed control that is cost-effective, environment-friendly, and acceptable to
She recommended that lowland vegetable farmers prevent the introduction of weeds by
thorough land preparation, manual weeding in combination with mechanical weeding,
mulching, intercropping, the introduction of beneficial organisms, and the use of chemical
For the latter, Dr. Dimaano emphasized the importance of understanding the mode of action as
well as the site of action for herbicides.
The mode of action describes the biological process or enzyme in the plant that the herbicide
interrupts, affecting normal plant growth and development. The site of action determines the
specific biochemical site that is affected by the herbicide.
She cited that the main importance of understanding the mode of action is that it helps farmers
understand how herbicides work, how they control weeds and still be safe for the crop.
They can also select the proper herbicide for each crop, diagnose herbicide injury, and design
successful weed management programs.
“Rotating herbicide modes of action, along with other weed control methods, is necessary to
prevent or delay herbicide-resistant weeds,” she cited.