ISHS Acta Horticulturae 370: International Symposium on Tropical Fruits
INTEGRATED MANAGEMENT OF PAPAYA IN MEXICO |
| Authors: | C. Flores Revilla, E. Garcia, D. Nieto Angel, D. Téliz Ortiz, J.A. Villanueva Jiménez |
| Keywords: | Carica papaya, PRV, roguing, aphids, vectors, IPM, Integrated crop management |
| Abstract:
Isolated control measures have been ineffective for papaya ringspor virus (PRV) in México, so the following actions were included in an integrated crop management (ICM) strategy to attempt PRV control: 1) Seedbeds covered with an insect proof polypropylene mesh; 2) High density papaya plantings (2222 plants/ha) allowed roguing of diseased plants; 3) foliage and soil nutrients to improve plant vigor; 4) Poisoned plant barrier (two lines of corn (Zea mays) and two of Hibiscus sabdariffa L.); 5) Two plastic strips, 5 cm wide and with a shiny gray-metallic color above each papaya row of plants; 6) Biweekly sprays with 1.5% mineral oil. Severity was assayed with an arbitrary scale in which) 0 = healthy plant; 1= Initial mosaic symptoms; 2= definite mosaic symptoms and 1-5 distorted leaves; 3= Mosaic and 6-10 distorted leaves; 4= Mosaic and more than 11 distorted leaves; 5=4 plus yellow leaf above fruit area; and 6= Dying plants. Non parametric analysis showed a median of 1.1 in ICM versus 3.11 in control plots, six months after transplanting. Three months later control plants had a median of 4. Severity increased in ICM plants in the following two evaluations to 4 and 5 respectively. Despite the deficiencies in roguing, yields in ICM and control plots were 28 and 17 ton/ha respectively. Aphid populations were similar in both plots. | |
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