| Abstract: In order to clarify whether or not Ditylenchus destructor infected garlic and carried by it, potato population (P-Dd) and sweet potato population (SP-Dd) of the nematode were selected as inocula, and the fi eld plot experiment and investigation were carried out during the overwintering growth period of garlic from March to June. The rhizosphere soil, root, stem disc and bulb of garlic were periodically collected, the nematodes were examined after being extracted from soil and garlic tissues and stained in garlic roots. The results showed that both P-Dd and SP-Dd populations could infect garlic, and they could invade the stem disc, root and new bulb of garlic. In rhizosphere soil, the maximum population densities of P-Dd and SP-Dd occurred both on May 2nd and were 107.0 per 100 g of soil and 65.6 per 100 g of soil, respectively. In garlic root, the maximum population densities
of P-Dd and SP-Dd occurred on March 14th and May 2nd and were 625.4 per 10 g of root and 1 303.3 per 10 g of
root, respectively. In stem disc, the maximum population densities of P-Dd and SP-Dd occurred on June 7th and
June 15th and were 1 681.8 per 10 g of stem disc and 2 983.3 per 10 g of stem disc, respectively. The garlic bulbs
were slightly infected, the maximum population densities of P-Dd and SP-Dd, both occurring on May 2nd, were
2.7 per 10 g of bulb and 1.6 per 10 g of bulb, respectively. At harvest, D. destructor was recovered from both stem
disc and bulb of garlic. It was clarifi ed that the two different host-sourced populations of D. destructor did infect
garlic and be spread by infected fresh garlics, although there were some differences in garlic infection between the
two populations. |