Silva Fennica

Fig. 1. (I) Rasamala trees planted in Graha Waskita, Bogor, West Java, Indonesia, (II) The treatments of methyl jasmonate and ethephon applied to (a) twig without incision (TW), (b) incised twig (TI), (c) incised branch (BI), (d) drilled branch (BD), (III) Rasamala balsam exuded from the incised twig.

Table 1. Effect of interaction of induction techniques; on the twigs by making incision (TI), on the branches by making holes using an electric drill (BD), and on the branches by making incision (BI) and chemical stimulants; ethephon and methyl jasmonate to Rasamala balsam exudation.
Stimulant	Concentration (% (w/w))	Rasamala balsam induced (gram)
Stimulant	Concentration (% (w/w))	on the twigs with injury (TI)	on the branches by making an incision (BI)	on the branches by making holes using an electric drill (BD)
Ethephon	0.1	0.28 ± 0.05^k	1.71 ± 0.60^hij	1.24 ± 0.60^ijk
Ethephon	1	0.52 ± 0.08^k	2.18 ± 0.74^fghi	1.90 ± 0.60^ghi
Ethephon	2	0.66 ± 0.05^k	2.54 ± 0.45^efgh	2.24 ± 0.57^fgh
Ethephon	5	0.70 ± 0.06^k	2.97 ± 0.88^def	2.42 ± 0.60^efgh
Ethephon	10	0.73 ± 0.13^k	4.98 ± 0.69^b	2.90 ± 0.38^defg
Methyl Jasmonate	0.1	0.84 ± 0.43^jk	2.45 ± 0.71^efgh	1.92 ± 0.47^ghi
Methyl Jasmonate	1	2.26 ± 1.30^fgh	3.72 ± 0.73^cd	1.90 ± 1.09^ghi
Methyl Jasmonate	2	2.35 ± 0.96^fgh	3.93 ± 1.37^c	2.00 ± 0.74^fghi
Methyl Jasmonate	5	2.51 ± 0.67^efgh	5.54 ± 0.85^ab	3.41 ± 0.51^cde
Methyl Jasmonate	10	2.62 ± 0.40^efgh	6.22 ± 0.78^a	5.05 ± 0.55^b
Values are presented as the mean ± SD. Three-factorial ANOVA was used to compare multiple means, with different letters indicating significant variations in distances (p < 0.05).