They should therefore, be used only when necessary as they cannot solve all pest problems encountered and besides they may be harmful to the environment, expensive and scarce at times
Choncho, agwiritsidwe ntchito pomwe ndikofunika kutero chifukwa sangathetse mavuto onse a tizilombo omwe akukumana nawo ndipo kupatula izi akhoza kukhala owopsa ku zachilengedwe, odula komanso osowa nthawi zina