67
Benut
tegnologievir
effektiewe
risiko-
bestuur.
Geelbastersvir ’nsuksesvolleoeskeeropkeer.
’nPakketmetverskillendegroeiklasseen
agronomieseeienskappe lewerdiebesteopbrengs
op joubelegging.
2014/MAIZE/A/03A
®Geregistreerde handelsmerke vanPANNARBPK, © 2014PANNARBPK
GLOBALE TEGNOLOGIE
PLAASLIKE PRESTASIE
Saam boer ons
vir die toekoms
™
Prevent nematode infestations by planting flowers and vegetables
that has nematode resistance. Such information can be obtained
from seed catalogues.
Theuseof organicmatter helps to retain soilmoisture and adds to
the available plant nutrients. Increased water and nutrient uptake
may help plants to withstand nematode attacks, since the plants
will be stronger.
Soil solarisation is an effective means to reduce plant-parasitic
nematodepopulations, but it’s best suited for small plots. It entails
the covering of small plots with transparent plastic during the
summer season when high day temperatures are experienced.
This strategy has been successfully applied inmany areas andhas
reduced root-knot numbers in several field trials.
The use of cover crops, such as the Vetiver grass and the Brassica
cultivar Nemat, has also been successful in reducing root-knot
nematode populations inbothgreen-house and field trials. Vetiver
grass can also add value for a producer where livestock forms an
integral part of the farming system.
Taking samples for nematode analysis
When to collect nematode samples
The best time for sampling varies from crop to crop and is related
to the growth stage of the crop plant and the objective of sampling
for nematodes. Most species of nematodes increase to high levels
during the growing season and reduce to lower numbers during the
dry season or the winter. Avoid collecting samples when the soil is
extremelywet or dry.
Sampling equipment
Soil auger or shovel or spade
Plastic bags
Labels
Waterproof/permanentmarker
Cooler bags
Bucket (formixing soil samples)
How to sample
Nematodes never occur uniformly throughout a field, therefore it
is advisable to randomly take several sub-samples across the field
(
Figure 1
) and then combine these subsamples. Because nematode
damage within a field can be patchy, collect samples from healthy
plants, aswell as fromplants showing symptoms. Keep these samples
separate and label them as “healthy” and “diseased”.
Figure 1: Zig-zagpattern for collectingnematode samples across a field.
