Classification of rubber varieties

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Rubber species in Vietnam usually develop rapidly in the early years, fast growing grafted wood, multiple warts, easy to graft. Growth ability during the shaving is poor.

PB235

Origin: Made in Malaysia, PB PBX 5/51 x PB S / 78.

Shape: There are auxiliary branches fall off, forming the main body straight, so the large timber reserves.
Growth: Good during basic construction, fairly good growth during shaving.

Rubber tapping mode: 1 / 2S d / 3. It is not suitable for mining with high intensity and high excitation, because it is susceptible to pus.
Productivity: Productivity varies according to environmental conditions and each year. High yields and early favorable areas, reaching a median in the unfavorable region. In the first 12 years, average yield is 1.6 tons / ha / year, PB235 production is concentrated in the last months of the year.

Other characteristics: Less susceptible to diseases, but susceptible to powdery mild disease. Land of elevation> 600 m (Highlands), unpolluted weather, PB235 significantly reduced yield due to severe white powdery mildew and frequent broken branches due to wind storm. The plant responds slowly to latex stimulants and is prone to dry shaving.

PB 255

Origin: Made in Malaysia, PB PBB 5/51 x PB 32/36. Growing in the southeastern rubber companies in recent years.

Body shape: slightly curved body when young. Low level, wide branch. Scurvy and low survival. The primary shell is thick, smooth, slightly hard, normal regeneration.
Growth: during the average growth period. Growth while shaving pretty.

Rubber tapping mode: 1 / 2S d / 3. Good latex stimulation response; Suitable for mild stimulated scales.

Productivity: The first year is low, increasing in the following years. Average productivity 2? 2.5 tons / ha / year. The yield of latex was very high in the favorable area and higher than in other varieties in Central Vietnam.
Other characteristics: Easily infected with ulcer scabbard and pink mushroom. Good wind resistance, is a promising variety for many areas of rubber trees with strong wind. Low nutrient or lack of care for slow growing plants. Note the shaving technique because the shells are thicker and harder than many other varieties.

Rubber tree

Varieties of rubber trees

PB 260

Origin: Made in Malaysia, PB PBIS 5/51 x PB 49. The seed is commercially grown in most of the recent rubber plantations.

Shape: Straight, round, elephant legs clearly, balanced, low branches self-fall. Medium thick, medium shelf, easy to shave, good regeneration.
Growth: Growth in the South East is very high, quite high in the Central Highlands. Growth while shaving pretty.
Rubber tapping mode: 1 / 2S d / 3. Suitable for light shave, medium latex stimulation, and should not be opened early when the shell is thin.
Productivity: In the South East, the early years of PB 260 produced lower than PB 235 but tended to increase in the following years. In the Central Highlands, high yields in the early years, exceeding many other varieties.

Other characteristics: Less or slightly infected with powdery mildew, susceptible to ulcer disease. Good wind resistance.

RRIM 600

Origin: Made in Malaysia. Genetics: Tj 1 x PB 86.

Shape: Straight, branched, large branches, wide spread. Medium shell, easy to shave. Removal, regenerative shell is prone to urethral.
Growth: grows during average KTCB. Growth when shaved pretty
Rubber tapping mode: 1 / 2S d / 2. Responds to moderate stimulants, can withstand high shear strength.
Productivity: Relatively high and stable in many areas. Average yields of 1.5? 1.6 tons / ha / year from the fourth shear on. In the first 12 years, the average productivity was 1.4 tons / ha / year.
Other characteristics: RRIM 600 is susceptible to pink fungus, rainy seasonally deciduous, ulcerated on the face, less white powdery mildew. This is a very promising breed for the Central Highlands and North Central Coast.

RRIV2 (LH 82/156)

Source: Vietnam Rubber Research Institute, 1982. Publication: RRIC 110 x RRIC 117.

Shape: Straight, round. Medium branching. The later fall leaves. Low and dense foliage when still young; Cuddly and open to adulthood. Medium, smooth shave, easy to shave.
Growth: The plant grows well in the early stages; growth while shaving well.

Rubber tapping mode: 1 / 2S d / 3. Limit the use of latex stimulants.

Yield: Low yield in early years, then increase and exceed PB 235. In the South East, productivity in the third year is over 2 tons / ha; The output is through the months of the year, satisfying the stimulation of latex.
Other characteristics: mild infections of all types. Poor tolerance.

RRIV 3 (LH 82/158)

Source: Vietnam Rubber Research Institute, 1982. Publication: RRIC 110 x RRIC 117.

Shape: Straight, round. Concentrate branches, low, many small branches in the young stage. Lower branches later drop themselves. Round, dense. Medium shave, easy to shave.
Growth: slow growth of primary trees, after faster growth than PB 235; growth while shaving well.

Rubber tapping mode: 1 / 2S d / 3.

Productivity: Increasing in years. In the South East, the productivity in the third year was over 2 tons / ha; The output is through the months of the year, satisfying the stimulation of latex.
Other features: White powdery mildew and pink fungus, rainy leaf rust and ulcer.