The influence of moisture on malathion applied at 10 p.p.m. to wheat with a graded moisture range of 10%, 12%, 14%, 16%, 18%, and :20% and stored at 60 F. was recognized by reduced morta1ities of sitophilus granarius (L)., Sitophilus oryza (L.), and Tribolium confusum Duv. with increases in moisture content. Results indicated that a moisture content of 12% is about the maximum safe level and 14%
... [Show full abstract] appeared to be the critical level of moisture in wheat when considered in regard to the persistence of biologically effective malathion deposits. Effectiveness of malathion applied at 10 p.p.m. to wheat of 10% moisture eon- tent and stored in temperature-controlled cabinets at graded ranges of 60º, 70º, 80º, 90º, 100º 11oº, and 120. decreased with increases in temperature, but maximum safe temperature ranges which may determine the persistence of malathion at effective levels on grain in storage were not clearly defined. Results from experiments concerned with the interrelation of moisture content, storage temperature, and dosages applied indicated the desirability of adjusting dosages of malathion to compensate for adverse effects of moisture content and storage temperatures that may be found in actual storage of grains.