Table 7 Population increase in Sitophilus zeamais and grain damage recorded in stored maize treated with the binary combinations of wood ash of Hymenocardia acida with leaf powder of Plectranthus glandulosus under fluctuating laboratory conditions (temp. = 22.76 ± 2.02 °C; r.h. = 69.87 ± 9.93%)

0

240.00 ± 12.25^a

240.00 ± 12.25^a

240.00 ± 12.25^a

50.50 ± 8.53^a

50.50 ± 8.53^a

50.50 ± 8.53^a

5

54.75 ± 25.15^b

118.50 ± 12.58^b

170.00 ± 7.07^b

69.02 ± 7.52^a

58.00 ± 8.98^a

63.50 ± 8.41^a

10

36.50 ± 4.56^b

102.25 ± 2.25^bc

128.25 ± 13.44^b

69.00 ± 1.35^a

62.02 ± 2.71^a

64.75 ± 2.66^a

20

38.75 ± 7.18^b

89.25 ± 5.75^bc

72.75 ± 2.53^c

59.12 ± 1.37^a

75.50 ± 1.50^a

82.00 ± 12.67^a

40

26.50 ± 7.17^b

68.00 ± 10.00^c

44.75 ± 11.62^c

58.50 ± 0.96^a

71.50 ± 2.50^a

53.75 ± 5.54^a

F _{(4; 15)}

45.08***

51.25***

58.05***

2.32^ns

3.02^ns

2.22^ns

0

49.61 ± 4.54^a

49.61 ± 4.54^a

49.61 ± 4.54^a

12.81 ± 1.49^a

12.81 ± 149^a

12.81 ± 1.49^a

5

21.92 ± 3.59^b

28.02 ± 1.55^b

36.81 ± 1.97^b

3.22 ± 0.82^b

5.07 ± 1.10^b

5.87 ± 1.16^b

10

18.20 ± 2.54^b

25.13 ± 1.43^b

30.41 ± 0.72^b

3.02 ± 1.36^b

4.15 ± 0.91^b

3.85 ± 1.14^b

20

17.25 ± 2.60^b

20.12 ± 3.01^b

27.95 ± 0.68^bc

2.94 ± 1.29^b

3.92 ± 1.00^b

3.43 ± 0.23^b

40

13.56 ± 1.17^b

17.20 ± 3.27^b

17.60 ± 2.00^c

1.54 ± 1.08^b

3.09 ± 0.67^b

2.79 ± 0.62^b

F _{(4; 15)}

22.25***

18.21***

23.68***

13.83***

13.86***

15.93***