Effect of Aliette on apple trees affected by crown and root rot caused by Phytophthora spp.

Adriana Pinto de T.1, Iris Carreña I.1 y Mario Alvarez A.1

A trial for the recovery of diseased Red King Oregon apple trees with crown and root rot caused by Phytophthora spp., by means of treatments with foliar sprays with Aliette (phosetyl Al). in different doses and a treatment with Ridomil (metalaxyl) applied on the ground around the trees, was carried out at Romeral, VII Region of Chile, between 1984 and 1987. Aliette in the dose of 300 g/100 It of water, sprayed every two months, between 1984 and 1986, and applied only on October, March and April, during the last season (1986/87). showed the fruit with the best size. Also, this treatment presented the highest percentage of exportable fruit, similar to Al iette 300 g, sprayed monthly between 1984-1986, but with no spray in the last season. It also showed the longest shoot growth average, together with treatment Aliette 250 g, sprayed every two months between 1984 and 1986, and in October, Oecember, March and April, in the last season (1986/87).

1 Estación Experimental La Platina (INIA), Casilla 439, Correo 3, Santiago, Chile.