NIGERIA – Bayer Nigeria Limited, a subsidiary of Bayer AG, , one of the largest pharmaceutical companies in the world, has developed and launched a new crop protection product known as Lagon to help farmers tackle the problem of weeds in cassava and raise yield.

Tested on more than 200 trials and demos across Nigeria and Tanzania, Lagon was rated among the top best pre-emergent herbicides for control of both grasses and broad-leaf weeds in cassava.

“The launch of Lagon aims to provide a big relief to farmers. These are exciting times for cassava farmers… Farmers need not worry about weeds anymore.”

Temitope Banjo, Country Sales Manager, Bayer Nigeria


Weeds have remained a major challenge to increased cassava productivity in Nigeria and Africa in general, with women spending about 500 hours annually to keep a hectare of cassava weed-free using hoes. The manual method of weed control compromises the health of resource-constrained farmers and in some cases, children are pulled out of school to support weeding. When left uncontrolled, weeds compete for water, nutrients and space with cassava and depress yield by 40-90%.

To tackle the menace of weeds, the International Institute of Tropical Agriculture (IITA) managed the Cassava Weed Management Project, and in the last eight years, screened more than 40 pre-emergent herbicides both on-station and on-farm. The trials and subsequent demonstrations were conducted in Abia, Benue, Ogun and Oyo states in Nigeria, and in Tanzania.

Across the four states, which represent the key agroecological zones that predominantly grow cassava in Nigeria, yield of cassava from Lagon treated fields were more than double the national average and were above 20 tons per hectare. Furthermore, cassava plants treated with Lagon were more vigorous compared to those on fields where the product was not used, as reported by Modern Ghana.

Dr Alfred Dixon, Director for Development & Delivery at the International Institute of Tropical Agriculture (IITA) said that the Cassava Weed Management Project team also conducted residue analysis on the leaves, stems and roots of cassava.

“The residue analysis provided negative results, meaning that Lagon is safe to be applied on field crops, particularly cassava.”

Dr Alfred Dixon, Director for Development & Delivery, IITA


Farmers who use Lagon commended the pre-emergent herbicide for its efficacy. According to Mrs. Ngufan Chichi, the use of Lagon on farmers’ fields was doing ‘wonders’ and helping farmers to upsurge their yields and profits. Mrs. Chichi who is a cassava commercial seed producer said the use of Lagon has helped her group to increase the size of their cassava farm in Benue, saving more on the cost of weeding.

Mrs. Chichi called on the government to support the dissemination of Lagon so that more farmers could have access to the product and make more returns from growing cassava.

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