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Observations On the Behaviour of Aphelenchoides Ritzema-Bosi in Chrysanthemum Leaves

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For more content, see Nematology.

The length of life-cycle of Aphelenchoides ritzema-bosi is 10 to 13 days. Each female lays about twenty-five to thirty-five eggs in compact groups. The eggs take 3 to 4 days to hatch and the larvae 9 to 10 days to reach maturity. Fertilisation and egg laying occur chiefly at the boundary between the discoloured and green portions of the leaf. The amount of free water inside the infested leaf is determined by weather conditions; eelworm activity in the leaf is, consequently, mainly confined to periods when there is rain or heavy mists. Early stages of chrysanthemum eelworm cannot resist desiccation as well as late stages. 95 per cent of late stage larvae and adults emerge from leaves immersed in water for 2 days compared with 12 per cent early stage larvae. Few small larvae invade leaves or migrate up the plant. Adults, unlike larvae, are able to swim because of the greater propulsive forces they generate. Adults and possibly fourth stage larvae are responsible for spread of infestations.

Affiliations: 1: Rothamsted Experimental Station, Harpenden, Herts., England


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