Côte d'Ivoire farmers' neem-and-chili grain mix inhibits both corn Fusarium species tested

The solvent ranking is the most useful finding in this work, and it comes with a catch. Water, methanol and dichloromethane were each used to pull compounds out of the same plant material, and the dichloromethane extract came out strongest ^[7]. Dichloromethane holds its place in a lab because it dissolves a very wide range of organic compounds ^[8], which locates the active chemistry of BioCC+ toward the less polar end. Someone steeping neem, lemongrass, garlic and chili in water at a village store is not making the preparation that produced these numbers ^[3].

The numbers are specific and modest. Growth of *Fusarium graminearum* was inhibited at 12.5 milligrams of extract per millilitre, and *Fusarium verticillioides* needed 25 ^[9]. In the units a formulator works in, that is 1.25 and 2.5 percent weight per volume ^[18], with the second species requiring exactly twice the first ^[17]. That gap matters for dosing, because a single field rate has to clear the harder target.

The design does more than declare a winner. The team tested whole extracts, then split them into smaller chemical fractions and retested each one to find where the activity concentrated ^[11], with mass spectrometry support from Penn State's Metabolomics Core ^[12]. Six candidate compounds emerged, two already known and four not yet characterised ^[10]. That is the right order of operations for a four-plant mixture, since knowing the blend works tells you nothing about what to standardise on, and four unnamed compounds is a fair description of how early this is.

These results stop short of showing whether treated corn is safer to eat. Both species were chosen because they produce toxins that sicken people and livestock ^[6], and toxin accumulation, not colony diameter, is the endpoint that governs whether a harvest is fit for sale. Nothing in the reported sequence measures it. Nor is there a reported head-to-head against a commercial fungicide. Describing BioCC+ as an alternative to fungicides describes the situation of the farmers, not a demonstrated equivalence.

The reason to keep watching is the arithmetic of the problem rather than the elegance of the assay. The FAO puts the cost of fungal contamination in stored grain across sub-Saharan Africa in the billions of dollars a year, alongside the public health burden ^[1]. Josephine Wee, who led the team, describes grain that is stored by a smallholder, collected, then stored again before it reaches a processor, with warm humid conditions driving mould at each stop and rising temperatures likely to make it worse ^[14]. Farmers in West Africa have used plant mixtures against that for generations without anyone measuring the effect ^[2]. Kporou frames the goal as affordable, locally produced treatment ^[15], and his group has already run preliminary field work with BioCC+ in Côte d'Ivoire ^[16]. The unfinished number is a per-tonne rate in a real store, with toxin assays attached.