Progressive Crop Consultant July/August 2019
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"<br />
In greenhouse experiments, the digestates<br />
of different substrates and processes<br />
were used to treat watermelon in soil<br />
infested with Meloidogyne incognita<br />
(root-knot nematode, RKN) to test the<br />
versatility of nematode suppression.<br />
"<br />
egg masses). Nematode-induced galling<br />
was similar or higher in plants from<br />
the digestate treatments than for plants<br />
from the control. A numerically small<br />
but significant reduction in root galling<br />
was found in food waste compared to<br />
manure. None of the digestates resulted<br />
in better plant growth when compared to<br />
the control.<br />
Small Field Experiments<br />
Microplot and small field experiments<br />
were conducted to implement the<br />
findings of controlled conditions into<br />
practical field contexts. Application<br />
strategies included drench application<br />
of the digestates as pre- or post-planting<br />
treatments. In a bell pepper microplot<br />
trial in RKN-infested soil, five different<br />
digestates were applied at planting. Three<br />
months later, plants were harvested and<br />
roots assessed for nematode suppression.<br />
The digestates did not result in improved<br />
plant growth compared to the control<br />
treatments. Nematode damage in roots<br />
was not reduced after treatment with<br />
digestates. Although, populations for<br />
RKN after harvest, were lower in plots<br />
treated with mesophilic manure and<br />
similar to the nematicide control. Similar<br />
studies were conducted with almond and<br />
walnut and ring nematode, root-knot and<br />
root lesion nematodes but results were<br />
somewhat variable indicating the need<br />
for improved application strategies.<br />
In summary, some beneficial effects of<br />
thermophilic digestates were observed on<br />
plant growth and nematode suppression<br />
Continued on Page 20<br />
0-Hour REI<br />
0-Day PHI<br />
No MRL<br />
Miticide,<br />
Insecticide,<br />
Fungicide<br />
• Fast, high efficacy results<br />
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– knockdown & curative<br />
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and eggs<br />
• Scale, mealy bug, aphid<br />
and more<br />
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• Multi-site activity – no known<br />
resistance<br />
• Tank mix compatible with sulfur<br />
• Excellent crop safety<br />
www.sym-agro.com<br />
541-607-5097 Info@Sym-Agro.com<br />
<strong>July</strong> /<strong>August</strong> <strong>2019</strong><br />
www.progressivecrop.com<br />
19
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