NEW TRENDS IN LEUCAENA PSYLLID RESISTANCE
The psyllid is a Latin American parasite which defoliates Leucaena,
causing widespread damage in established plantings throughout
Asia. During 1987 the Nitrogen Fixing Tree Association (NFTA)
established a Leucaena Psyllid Research Trial with cooperators
at 12 international locations, including the Waimanalo Research
Station, Hawaii. The trial evaluated psyllid resistance and fodder
yields of 13 Leucaena varieties and hybrids. Trials were evaluated
monthly for psyllid adults, nymphs, eggs and damage based on a
1-9 rating system. Fodder cuttings were taken from a 5 m row of
trees spaced 25 cm apart at 6,9, and 12 months. Although the first
year's measurements haven't been completed, initial results from
psyllid-resistant tree strains have already been received from
A complete study summary will be published in Leucaena Research
Reports Volume 9.
Elevation: 300m. Precipitation: 1628 mm. Soil pH 4.8-5.2. Best
growth and psyllid resistance was observed with Lucaena strain
KX1 followed by K785, KX2, K376 and K784, which is nearly the
same order as observed in Hawaii.
Nueva Ecija, Philippines
Elevation: 236 m. Precipitation 1850 mm. Soil pH 4.4. Very low
soil fertility, long hot dry season. Heavy psyllid damage with
Mealy Bug infestation on L. pallida and L. diversifolia (K156).
Best performers were K785, K743, KX1, KX2 and K636.
Bob Wheeler NFTA News, Number 6, May 1988. P.O. Box 680, Waimanalo
HI 96795, U.S.A.