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5. Effects of plant inducer on fruit yield of chilli<br />
under field conditions<br />
The result of fruit yields of all treatments<br />
in both varieties is presented in Figure 6. Fruit<br />
yields of inducer treatment were not significantly<br />
higher than the untreated control in each harvesting<br />
Kasetsart J. (Nat. Sci.) 40(1) 45<br />
time in both chilli varieties, except treatment with<br />
Bion ® . It was noted that after five weeks of<br />
harvesting time, the peak of Bion ® treatment in<br />
cv. Mae Ping increased sharply. However, the total<br />
fruit yield of Bion ® treatments was significant<br />
lower than the others. Treatment with T. harzianum<br />
Table 1 Effects of plant inducer on fruit anthracnose disease and the relation between disease incidence<br />
and fruit yield of chilli cvs. Mae Ping and Man Dum under field conditions.<br />
Treatment Disease% Reduction of Fruit yield Weight of Fruit weight Insect<br />
incidence1/ disease compared (g / plot) 1/ healthy fruit2/ (g/fruit) 1/ incidence1/ (%) to control (g) (%)<br />
Mae Ping variety<br />
T. harzianum 38.1 a 24.2 4883.6 a 3022.9 9.8 a 10.4<br />
Salicylic acid 40.3 a 19.8 4532.1 a 2705.6 10.1 a 10.0<br />
Bion ® 11.9 b 76.3 3092.9 b 2724.8 6.9 b 11.2<br />
Untreated control 50.3 a - 4492.1 a 2232.5 9.6 a 9.8<br />
CV (%) 12.6 9.6 19.8 6.6 16.8<br />
F-test<br />
Man Dum variety<br />
** * ns * ns<br />
T. harzianum 11.5 bc 57.4 3298.7 a 2919.4 5.4 8.2<br />
Salicylic acid 17.1 b 36.6 2684.5 b 2225.5 5.8 7.4<br />
Bion ® 6.5 c 75.9 780.0 c 729.3 4.8 8.3<br />
Untreated control 27.0 a - 2533.7 b 1849.6 5.9 6.3<br />
CV (%) 17.6 6.0 10.9 4.5 16.6<br />
F-test ** ** ** ns ns<br />
1/ Data (X) were collected until the last harvesting time and transformed to square root x + 05 . before analysis.<br />
2/<br />
Means of nontransformed data were presented for clarity. Values in each column followed by the same letter were not<br />
significantly difference (P ≤ 0.05).<br />
Weight of healthy fruit was calculated based on percentages of uninfected fruit per total fruit yield.<br />
Fruit yield (kg/plot)<br />
2.0<br />
1.6<br />
1.2<br />
0.8<br />
0.4<br />
0.0<br />
1<br />
2 3 4 5 6 7 8<br />
Harvesting time (week)<br />
2.0<br />
Mae Ping Man Dum<br />
1.6<br />
Harvesting time (week)<br />
Figure 6 Fruit yield of chilli at each harvesting time on cvs. Mae Ping and Man Dum applied by<br />
T. harzianum (—●—), salicylic acid (—■—), Bion ® (—▲—) and control (—*—).<br />
Fruit yield (kg/plot)<br />
1.2<br />
0.8<br />
0.4<br />
0.0<br />
1 2 3 4 5 6 7 8
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