“Key Informant Survey” of Production, Value, Losses and ... - DfID

Table IV.B.9. Catches over four to five weeks of four plastic traps and four soaked blocks in each of three
zones, as total catches and projected persistence until daily catch fell below one fly. Statistical analysis was by
two-way replicated ANOVA: blocks were significantly superior to traps in estimated total mortality but not in
estimated persistence.
Sum (No.) Persistence (days)
Trap Block Trap Block
Mean 107.7 448.4 124.4 280.7
S.D. ±30.8 ±181.6 ±70.1 ±366.8
F Treatments 49.1629[1,18]*** 1.9990[1,18]ns
Sites 3.1032[2,18]ns 0.4243[2,18]ns
Interaction 1.0682[2,18]ns 1.0351[2,18]ns
The second evaluation, of soaking doses, did not feature lower collectors for calibration. Collectors
were emptied daily. Table IV.B.10 shows the mean central collector catches obtained, with variations in the levels
of alcohol, methyl eugenol and malathion.
Table IV.B.10. Collector catches in three zones after 27 days by mixes of solvent:lure:insecticide, with original
6:4:1 mixture underlined and individual changed values in bold italics. Analysis was by two-way unreplicated
ANOVA.
Variable Total catch (No.) Persistence (days)
Solvent Mixture 4:4:1 6:4:1 8:4:1 4:4:1 6:4:1 8:4:1
Mean 809.7 818.7 849.7 65.5 53.4 62.1
S.D. ±109.9 ±202.1 ±23.7 ±6.9 ±3.1 ±2.5
Lure Mixture 6:2:1 6:4:1 6:6:1 6:2:1 6:4:1 6:6:1
Mean 774.7 818.7 887.3 59.6 53.4 73.5
S.D. ±40.1 ±202.1 ±335.2 ±2.5 ±3.1 ±19.0
Insecticide Mixture 6:4:1 6:4:2 6:4:3 6:4:1 6:4:2 6:4:3
Mean 818.7 785.0 757.0 53.4 65.9 59.6
S.D. ±202.1 ±101.3 ±20.8 ±3.1 ±2.5 ±9.0
F
Mixtures 0.3464[6,12]ns 1.5811[6,12]ns
Zones 4.0413[2,12]* 0.8421[2,12]ns
The third evaluation, of blocks of different wood substrates, was run for only four days, and as a result
persistence could not be estimated and the four days’ data were pooled. Table IV.B.11 gives the percentages of
total catch estimates in the central collector for each wood and Table IV.B.12 gives their total kill estimates.
Table IV.B.11. Percentage of total kill estimates in central collectors, from wood substrate experiment, over
four days in seven traps in two sites. Overall mean was 79.3% (S.D.=19.5). There was no significant difference
among woods (one-way ANOVA F=0.2597[3,24]ns).
Wood Plywood Acacia Mulberry Poplar
Mean (%) 81.0 80.2 79.0 76.8
S.D. ±17.4 ±17.6 ±19.0 ±24.0
Table IV.B.12. Total kill estimates (N=7 in two zones) by blocks of four woods in four days. Among all four
woods there was a significant difference (one-way ANOVA F=6.0932[3,24]**); individual means with different
suffix letters were different at P