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The Influence of Planting Date of Carrot On Meloidogyne Incognita Reproduction and Injury To Roots

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For more content, see Nematology.

Carrot cv. Emperator was direct seeded into Meloidogyne incognita infested sandy loam field plots at Tustin, southern California, on five dates each two weeks apart starting in mid-October. Harvest dates were similarly staggered in the following spring. Significant differences in plant weights at harvest were not found. Percentages of tap roots rendered unmarketable due to galling and forking symptoms were 50.3, 30.8, 19.3, 8.9 and 11.2 respectively on the five plantings. Root injury was related to the level of infection in early season, as influenced by soil temperatures that fluctuated near the M. incognita activity threshold of 18°C. Accumulated temperature, particularly from mid-season onward, determined final nematode numbers, which were significantly (P = 0.05) more on the fourth and fifth plantings. The importance of changing planting dates of winter vegetables for suppressing root-knot nematodes was demonstrated.

Affiliations: 1: Department of Nematology, University of California, Riverside, Stationed at Kearney Agricultural Center, 9240 South Riverbend, Parlier, CA 93648, U.S.A.


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