Breeding of Fruit and Plantation Crops 2 + 1

PB 28/59 , PB 217, RRIM 703 & PB 217

PB 28/59: A Malaysian clone with fluted and crooked trunk sometimes showing tendency for leaning, Moderate to heavy branches, Girth at opening medium and girth increment on tapping poor. Virgin bark thickness low thickness on renewal above average. Average annual yield is 1,423 kg/ha/year. Susceptibility to wind damage is medium. Occurrence of tapping panel dryness is severe. The clone is highly prone to abnormal leaf fall, pink and powdery mildew diseases.

PB 217: The parents of this Malaysian clone are PB 5/51 and PB 6/9. Trunk tall and straight. Wintering and refoli¬ation are normal to late. Girth at opening is medium, girth increment on tapping high. Virgin bark thickness is low but renewed bark is medium in thickness. Average yield is 1,257 kg/ha/year. Latex colour is light yellow. Wind damage is very low. Tapping panel dryness mild. Inci¬dence of phytophthora severe in Malaysia but low in India. Pink and powdery mildew diseases severe.

RRIM 703: The parents of this clone are RRIM 600 and RRIM 500. It has an upright trunk. High yielding with yield trend from the eighth year of tapping. Girth at opening is high to medium and girth increment on tapping low. Virgin bark thickness is high and renewed bark thickness medium to high showing tolerance to powdery mildew. The average annual yield is 1,310 kg/ha/year. Latex colour is light yellow. Wind damage and tapping panel dryness high. Abnormal leaf fall is severe in India, though reported to be only mild in Malaysia. Occurrence of powdery mildew is mild. The clone is prone to severe pink disease.

PB 217

Country of origin
Malaysia
Developed by
Prang Besar Estate
Parentage
PB 5/51 x PB 6/9
Mean Yield	5 Years	10 Years	15 Years
Large scale evaluation(g/tree/tap)	38.39	48.86	59.90
Commercial evaluation(kg/ha/yr)	1262	1510	1508
Vigour
Average
Incidence of major diseases and pests
Pink-severe
Powdery mildew-severe
Abnormal leaf fall - moderate
Reaction to stresses
Cold-average tolerance
Drought-above average tolerance with respect to yield but growth is affected
Occurrence of TPD
Low
DRC
Average
Special features
A hardy clone suitable for small growers. Shows good response to stimulation.