It is most conveniently prepared in aqueous form immediately prior to use, for example, as {HEAD ~ a spray} for {TAIL ~ insect} infested crops 
for
It is most conveniently prepared in aqueous form immediately prior to use , for example , as { HEAD ~ a spray } for { TAIL ~ insect } infested crops
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH