Sowing times

Stem borer (%)

Stem rot by bacteria (%)

Root rot by fungi (%)

March

16.6 ab

17.1 a

12.7 a

April

20.8 a

13.5 abc

10.5 ab

May

14.8 bc

14.3 ab

9.6 b

June

15.8 ab

11.6 bcd

9.1 b

July

10.0 cd

8.7 cd

8.3 bc

August

7.4 d

6.7 d

6.3 c

P

<0.01

0.01

<0.01