Table S2. Frequency of DNA detection at different insect densities present in stored wheat flour.

Insect equivalents as adults	N(T. castaneum beetle)/(m(wheat flour)/g)	Ct value
10	10/5	16.8±.02
1	1/5	22.73±0.23
0.1	1/50	26.95±0.17
0.01	Corresponds to 1/500	27.87±0.32
0.001	Corresponds to 1/5000	28.84±0.08

Each value is represented as mean±S.D. (N=7), Ct=cycle threshold