Integrated Weed and Pest Management (IWPM): Combining Agrochemicals with Cultural Methods

Integrated Weed and Pest Management (IWPM) offers a sustainable strategy for Indian farmers, blending targeted agrochemicals with cultural practices to reduce losses from weeds and pests, which can account for up to 65% of potential yield. This holistic approach minimises resistance, cuts chemical overuse, and boosts eco-friendly productivity amid climate variability.

Core Principles
IWPM follows a science-based hierarchy: prevention first, then monitoring, cultural controls, biological agents, and, as a last resort, precise agrochemicals. It leverages weed ecology, crop competition, and environmental data to keep populations below economic thresholds, thereby avoiding reliance on a single strategy.
In rice-wheat systems, common in India, IWPM integrates puddling for weed suppression, optimal seeding rates, and herbicide thresholds to prevent shifts, such as resistance to isoproturon in Phalaris minor.

Cultural Methods
Cultural practices form IWPM's foundation. Crop rotation disrupts weed cycles, and legumes after rice suppress grassy weeds via allelopathy and nitrogen fixation. High-quality seeds, narrow-row planting, and competitive varieties like early-vigour rice smother invaders.
Tillage timing, such as zero-till wheat or raised beds for blackgram, buries seeds while conserving moisture; mulching and stale seedbeds exhaust weed banks pre-planting. Flooding in transplanted rice naturally drowns broadleaves, enhanced by cono-weeding for mechanical uprooting.

Agrochemical Integration
Integrated Weed Management (IWM) optimises costs by using pre-emergence pendimethalin, followed by targeted post-emergence sprays, reducing chemical loads by 30-50%. Simultaneously, insecticides are applied only at economic injury levels based on pheromone trap monitoring, thereby protecting beneficial predators such as ladybirds. Nano-formulations and drones ensure spot treatments, aligning with IPM to dodge residues and resistance.​

Benefits and Implementation
IWPM lifts yields by 20-30%, lowers costs, and sustains soil health for marginal farmers. Challenges such as labour shortages are addressed through mechanisation, with FPOs and extension services promoting demo plots. Government IPM schemes and digital advisories scale adoption, fortifying food security. This synergy empowers resilient farming.