Assessment of tolerance to a canker and wilt pathogen of Acacia hybrid, Acacia auriculifomis clones and families of A. mangium by artificial inoculation in nursery
Keywords:
Ceratocystis,, Acacia hybrid,, A. auriculiformis, A. maingium, artificial inoculationAbstract
Acacia species including Acacia auriculiformis, A. magium and Acacia
hybrid (A. mangium A. auriculifomis) are among the main forest plant
species in Vietnam, with an area of over 1,500,000 hectares. Currently,
many acacia plantations, especially Acacia hybrid and A. mangium
plantations in Vietnam are being attacked by a canker and wilt pathogen
Ceratocystis manginecans, causing tree death in many provinces across the
country. It is essential to select and plant Acacia clones that have both rapid
growth and resistance or tolerance to disease. An experiment of artificial
inoculation of C. manginecans on cutings of three Acacia auriculifomis clones, four Acacia hybrid regconised as Technologically advanced
cultivars, six Acacia hybrid clones regconised as National cultivars,
seedlings of six families of Acacia mangium, seeds collected from the 2nd
generation seed garden and 44 newly selected Acacia hybrid clones, the
experiment was conducted in the nursery of the Vietnames Academy of
Forest Sciences in order to select Acacia hybrid clones which are
resistant/tolerant to a canker and wilt pathogen. After 45 days of
inoculation, the results showed that two A. auriculiformis clones Clt18 and
Clt19 resistant at C0 level were relatively more resistant to C. manginecans
(p <0.001) than the A. mangium families which are at C3 level. Meanwhile,
the lesion length of the Acacia hybrid clones is in the range of the lesion
length of A. auriculiformis clones and of the lesion length of the
A. mangium families. Among the hybrid clones, the lesion length of the
BV10 and four newly selected clones (102, BV316, BV567 and 92/1) had
the same (p <0.001) lesion length of the A. auriculiformis clones resistant at
C0 level. The percentage of death trees of Acacia clones/families was
correlated with the lesion length of the pathogen on the stem (R
2
= 0.77 -0.82). Acacia hybrid clones resistant to a canker and wilt pathogen at C0
level are potential varieties for future development of acacia plantations.
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