reporter: kamau mbogo's organization promotes sustainable pest control. kamau: youse a good pest -- you can say a friendly pest, to ed on the bad pests thatre eding on yr crop. and this is a technology that is used in the cut ower. they have perfected it. reporter: that's nothing new for him.efore any sticides we avaible herethe farms used a species of ant to eradicate cropests. but it's also true that the insecticide they use now is highly efficient -- even if it is expensive. back at la naivasha,he day's catch already oits way to market -- which these days, is several kilometers away. the lake's wat level useto ach as fars the mark. now it's shrinking -- along with its fish stocks. too many companies are pumping too much water from the lake. it's almost 30 degrees in the shade, so the fish have to be sold off quickly. it's a good day for the women of e market. their huands broug sackloads back wh them. since a small tilaa fetches one euro at the moment, the haul will translate into a tidy profit. for today, at least. roseline: have this imprement. becau

farmers s are offered d advicn sustaiainable practitices by an organization headed by kamau mbogo. he also o wants to know w whye lake is constantly being popolluted ul: the farmers within this areare u usingertililize. and that cannot bevovoided beuse of e enomical status they have tomprove their haharvesevery y ason. ruth: the e is lot of f gap bebetwn the technology that is avaible inhe big fms a and what the sll scaca farmers a are doing. and alsoso the kind ofof adviy theyey get. because eveven when he h has a problem withth his potatoeoese just goes toto the chemimical e and he says,s, i have thisis problem.m. but they d don't get to o getn advice frorom the other r mets that couould be used t that aree suststainable. reporter: : kamau mbogo'ss orgaganization proromotes sustainanable pest conontro. kamau: y y use a good d pest - you can n say a friendndly peso ed on the e bad pests that are feedinon y your crop. and thisis is a technonology ths useded in e cut t flower. they h have perfecteted it. rereporter: thatat's nothing n r him. before any pesticid w were avaiailae here