Mango nematodes.
Milne D. L., Villiers E. A. de, Van den Berg E.
Author Affiliation: Plant Protection Res. Inst., PO Box X134, Pretoria 001, South Africa.
Citrus and Subtropical Fruit Journal : 17, 19, 21
Abstract : In a survey of mangoes in South Africa 16 species of plant-parasitic nematodes were found of which the commonest were Pratylenchus and Helicotylenchus. A control trial was carried out on a site where old mango trees showed severe decline and were heavily infested with Xiphinema brevicolle, Hemicriconemoides mangiferae and various hoplolaims. Phenamiphos at 25 kg a.i./ha and DBCP at 11 litres a.i./ha were applied in the irrigation basins. Nematode populations were reduced although phenamiphos had little effect on Xiphinema. Tree response could not be determined but there was no phytotoxicity. Growers are advised to ensure that nursery stock is nematode-free.ADDITIONAL ABSTRACT:Sixteen nematode spp. were recorded in a survey of mango nurseries and declining field plantings; the commonest genera were Pratylenchus and Helicotylenchus. In a trial with old mango trees showing severe decline on nematode-infected soil, the effects were compared of DBCP at 11 l/ha and phenamiphos at 25 kg/ha, each applied in the irrigation basins. Both nematicides greatly reduced the nematode populations, assessed after 12 and 24 months, but DBCP was much the more effective. No phytotoxicity resulted from either treatment.