| laboratory evaluation of bacillus thuringiensis h-14 against aedes aegypti larvae in the northeast region of thailand. | laboratory bioassays using a preparation of bacillus thuringiensis h-14 (bt.h-14), namely skeetal were conducted to determine their effectiveness against late 3rd/early 4th instar larvae of aedes aegypti. the larvae were collected from municipal areas in 7 provinces, namely burirum, roi-et, khon kaen, ubol ratchatani, nakorn phanom, surin and nakorn ratchasima, in the northeast of thailand. it was found that for skeetal, lc50 ranged from 128 to 151 nl/l (average 143) and lc90 ranged from 254 to ... | 1991 | 1818396 |