Root-Knot Nematode M. hapla in roses in Ethiopia

henry_kuskaAugust 13, 2014

"During two surveys conducted in August 2011 and April 2012, M. hapla was detected in soil samples from six out of nine rose producing farms located in the districts of Ziway, Holleta, Sebeta, and Menagesha. At infested farms, rose plants appeared stunted and less productive and often showed symptoms of chlorosis and wilting"


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seil zone 6b MI

Let's hope no one is importing roses from Ethiopia.

    Bookmark   August 14, 2014 at 7:12PM
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One important contribution of the Ethiopa paper is that it lists the symptoms. Is this important for rose gardeners to be aware of?
The following: "Meloidogyne hapla, the northern root-knot nematode, is the major nematode pest of roses and has a worldwide distribution (Berge 1971, Coolen and Hendricks 1972, Berge et al. 1974, Santo and Lear 1976, Ohkawa and Saigusa 1981, Daiber 1985)."

is from:

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    Bookmark   August 14, 2014 at 8:21PM
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"Although California has many different species of root-feeding nematodes, the most damaging ones to gardens are the root knot nematodes, Meloidogyne species. Root knot nematodes attack a wide range of plants, including many common vegetables, fruit trees, and ornamentals. They are difficult to control, and they can spread easily from garden to garden in soil on tools and boots or on infested plants. "

H. Kuska comment: I wonder how many people that think (or are being told in this forum) that they have "heat" problems with their roses actually have root knot nematode problems?

"Aboveground symptoms of a root knot nematode infestation include wilting during the hottest part of the day even with adequate soil moisture, loss of vigor, yellowing leaves, and other symptoms similar to a lack of water or nutrients. Infested vegetable plants grow more slowly than neighboring, healthy plants, beginning in early to midseason. Plants produce fewer and smaller leaves and fruits, and ones heavily infested early in the season can die. Damage is most serious in warm, irrigated, sandy soils."


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    Bookmark   August 15, 2014 at 12:23AM
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Campanula UK Z8

It was inevitable..... since rose growing in Africa is essentially just more of the same intensive agricultural ecocide which puts short term profits over long-term soil husbandry.

    Bookmark   August 15, 2014 at 7:39AM
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