Diplocylos palmatus L.: a new weed host of papaya ringspot virus
1990
Magdalita, P.M. | Bayot, R.G. | Villegas, V.N. | Espino, T.M. (Philippines Univ., Los Banos, College, Laguna (Philippines). Inst. of Plant Breeding)
The study was undertaken to identify possible weed hosts of papaya ringspot virus (PRSV) in the Philippines. Weeds growing in papaya plantations with high incidence of papaya ringspot were observed very closely for the presence of virus-like symptoms. Weed species with such symptoms were collected, their sap extracted separately in sterile mortar and pestle and inoculated mechanically to healthy papaya seedlings. Out of the twelve plant species tested, only the sap of Diplocyclos palmatus was able to induce symptoms in papaya seedlings which were very similar to papaya ringspot. Healthy Diplocyclos palmatus plants also exhibited virus-like symptoms such as mottling, crinkling, rolling and narrowing of the leaves when inoculated with crude sap of PRS-infected papaya leaves. Reciprocal inoculation of the crude sap to papaya seedlings also produced typical symptoms of papaya ringspot. This was further confirmed by aphid transmission using Myzus persicae and by electron microscopy using the leaf dip method. These tests proved that Diplocyclos palmatus is indeed a new weed host of PRSV.
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