Bls. Olson et al., Efficacy and metabolism of MON 37500 in Triticum aestivum and weedy grass species as affected by temperature and soil moisture, WEED SCI, 48(5), 2000, pp. 541-548
Spray application of 24 and 46 g ha(-1) MON 37500 was used in efficacy stud
ies, and vacuum infiltration or droplet application of radiolabeled MON 375
00 was used in metabolism studies to evaluate temperature and soil moisture
on MON 37500 efficacy and metabolism. Day/night temperatures before vs. af
ter application of MON 37500 of 25/23 vs. 25/23, 25/23 vs. 5/3, 5/3 vs. 25/
23, and 5/3 vs. 5/3 C were evaluated for the efficacy study whereas day/nig
ht temperatures of 5/3 and 25/23 C were used for the metabolism study. Soil
moisture of one-third and full pot capacities was evaluated for both studi
es. No Triticum aestivum injury was observed at the different temperatures
or soil moistures because of rapid metabolism of MON 37500 by T. aestivum.
Weed control was greater when the temperature after application was 25/23 C
or soil moisture was at full pot capacity than when the temperature was at
5/3 C after application or soil moisture was at one-third pot capacity. Su
sceptibility to MON 37500 was greatest for Bromus tectorum, moderate for Av
ena fatua, and least for Aegilops cylindrica. This pattern of susceptibilit
y for the weed species was related to their ability to metabolize MON 37500
. Aegilops cylindrica metabolized more MON 37500 in the first 24 h than did
A. fatua, whereas B. tectorum metabolized the least MON 37500. Cool air te
mperatures decreased MON 37500 metabolism in all species, whereas soil mois
ture had no effect.