Lookwatering 62 2635 EA Den Hoorn (ZH) Postbus 38 2290 AA Wateringen Tel. 015-2124143 Fax 015-2147594 E-mail: info@denhaan.nl Euro Tuinbouw Adviezen C.V.: Horticonsult
Research laboratory and horticultural consultancy
Symptoms:
Aphelenchoides fragariae is causing the problems seen in figure 1. Black stains in the leaves sharply bordered by the veins. From damaged flower- and leaf buds Are growing deformed leaves and flowers also. Serious infection with this nematode is causing the death of flower buds. Foliar nematodes overwinter in the intercellulairy spaces in the leaves or in the buds in the water film between the scales of buds. When the temperature is rising in the spring, the nematodes become activated and turn into ectoparasites who are feeding on epidermal cells in their vincinity. This feeding is causing the dark brown patches (scar) on the leaves. Through their secretions they are also able to cause several other symptoms. Browning and failure of the shoot to grow, distorted leaves and bushy plants are the main problems caused by these nematodes. The spread by moving themselves up the stem of uninfested plant, through a water film during humid and rainy weather.They enter the leaves through the stomata of the plants.
Treatment:
Do a treatment during the resting period. You can do a treatment with a warm water treatment. 60 Minutes with up going temperature from 15 °C to 43,5 °C. Then an other 60 minutes at a temperature from 43,5 °C. Let the plants cool down inwater with a temperature from 10 - 15 °C, add thiram to this water.
Additional questions can be addressed to:
Relab den Haan B.V. P.O. BOX 38 2290 AA WATERINGEN
