Effects of dietary sodium on performance, flight and compensation strategies in the cotton bollworm, Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae)

Table 1 A repeated-measures ANOVA for effect of diet and larvae age (days after hatching) on larvae body weight

Source	df	MS	F	P
Diet	2	21818.20	8.61	0.0003
Error a	188	2535.45
Larvae age	1.85	2957949.84	1167.02	<0.0001
Larvae age × Diet	3.71	12545.52	4.95	0.0010
Error b	348.40	2534.63

Above statistical computations were performed by the program SPSS 16.0 for Windows (SPSS for Windows xp; SPSS, Inc., Chicago, IL). H. armigera larvae were fed on diet A, B and C. Diet A was a conventional diet. Diet B was modified from the conventional diet in which half amounts of NaCl and NaF in Wesson salt mixture were replaced with equal mole of KCl and KF, respectively. Diet C was modified from the conventional diet in which all NaCl and NaF in Wesson salt mixture were replaced with equal mole of KCl and KF.