Biological control of Meloidogyne incognita on fig [Ficus carica] trees with the bacterium Pasteuria penetrans
1998
Kamata, N. (Shizuoka-ken. Citrus Experiment Station, Shimizu (Japan)) | Okada, M. | Anma, S.
An isolate of Pasteuria penetrans, originating from and cultured on Meloidogyne incognita, was investigated in two experiments as a biological control agent against M. incognita infesting soil of container cultivated fig trees. In the first experiment, 2 x 10(10) P. penetrans spores per square meter soil surface area was applied to the 70 l pots containing five-year-old fig trees in soil with an established infestation of M. incognita in april. Seven months after treatment, an average of 15 spores of P. penetrans adhere to the cuticle of a second stage juvenile of M. incognita present. In the third year, the growth of fruit bearing fig shoots were more vigorous and the yields of fruit were greater in P. penetrans treated plots than those of untreated plots. In the second experiment, one-year-old fig trees were transplanted to 25 l containers filled with M. incognita infested soil and suspensions of P. penetrans 5 x 10(10), 2 x 10(10) and 5 x 10(9) per square meter soil surface spores were applied to containers for each treatment. In all treatments had P. penetrans spores adhering to the cuticle of M. incognita juveniles five months after application, and containers receiving the most dense spore suspension had the greatest numbers of adhering spores. In the second year, the growth of fruit bearing shoots, fruit weight and fruit set were greater in the P. penetrans treatments than in those of untreated trees
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