Aspectos da ocorrência de Phytophthora spp. em pomares cítricos em regiões de cerrado do estado de Goiás
Palavras-chave:
solo fértil, período chuvoso, phytophthora spp., doença criptogâmica, pomar cítricoResumo
Survival of Phytophthora spp. was studied on local lesions of the stem of citrus end in soil beneath citrus grove in the Cerrado region at the and of the rainy and dry seasons. Isolations were made using apple fruits, orange fruits, and tissue from the base of young pineapple leaves. The apple technique gave the most consistent results. The level of recovery of the fungus from the local lesions was higher at the end of the rainy season than at the end of the dry season, while in the soil, the reverse was true. At the end of the dry season the inoculum level was higher in medium (10-15 cm) and deep (25-30 cm) layers than in the superficial (0-5 cm) one, while at the end of the wet season the inoculum level was higher in the superficial and medium layers. It was concluded that the survival of the fungus in the soil is influencied by the interaction of temperature, humidity and microflora.
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