抄録
Five alcohols (ethanol, n-propanol, iso-butanol, iso-pentanol, and 2-methyl-1-butanol), extracted and identified from culture filtrates of Fusarium oxysporum, were examined for their attractiveness for Rhizoglyphus robini in sand. Mites preferred the mixed-alcohols (90 : 1 : 4 : 4 : 1 in the order named) to sterile water, and they were attracted to the alcohols from a distance of 3 cm within 24 hr. Although each alcohol showed a varying degree of attractancy for mites, the effect was most extensive in ethanol, iso-butanol and iso-pentanol. Furthermore, a piece of healthy rakkyo bulb attracted mites through sand, but its intensity was strongly enhanced by pouring the mixed-alcohols on the piece, which was similar to mite preference for Fusarium-infected rakkyo bulbs over healthy bulbs.
