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SUSCEPTIBILITY OF SOME RUBBER (Hevea brasiliensis) CLONES TO MISTLETOE INFESTATION: A CASE OF RUBBER RESEARCH INSTITUTE, RUBBER ESTATE, EDO STATE, NIGERIA
Abstract
The study was conducted to determine the susceptibility of different hevea clones to mistletoe infestation at the
polyclonal plantation of Rubber Research Institute of Nigeria (RRIN) Rubber Estate, Iyanomo, Edo State,
Nigeria which lies on longitude 50o 27″E and latitude 60o 23″N. Four clones: NIG 800 and NIG 804 (both
indigenous), and PR 107 and GT 1 (both exotic/foreign), laid out in a plot (block) of 21 x 23m comprising 483
rubber trees per clone were studied. Three hundred and twenty two (322) rubber trees in each plot were randomly
selected and assessed for the disease incidence using standard procedures. The result obtained showed NIG 800
had the highest percentage (77.95%) of infection (251 trees infected), NIG 804- 74.53% (240 trees infected),
RRIM 707- 42.83% (138 trees infected) and GT 1- 36.34% (117 trees infected). Therefore, mistletoe infestation
was severe on the indigenous clones compared with the exotic clones. Thus, more research is needed on the
development of indigenous resistance clones to enhance high latex yield. Regular pruning of affected tree parts is
also recommended.
