Nematode management
The root-knot nematode
Meloidogyne incognita
is one of the major nematode pests in onion. Severe infestation causes
reduction in onion bulb weight of 70%. Stunting and galling of roots or
thickening of roots are the symptoms of onions heavily infected with
nematodes. Delayed maturity of bulbs with thicker necks and smaller bulbs
are some of the other symptoms. The nematode is particularly
devastating in the seedling stage and amounts to huge loss at the seedling
stage alone. Various incidences of the root-knot nematode in onion have
been reported all over the world.
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Root knot Infected root of
onion
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Onion nursery applied with
biopesticides
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Management of nematodes in onion
Application in new planting
1. Seed treatment
Pre-coat
seeds with biopesticide before sowing.
·
Add biopesticide
Pseudomonas fluorescens
at 20 ml/kg or 20 g/kg seed.
2. Substrate treatment
Preparation for raising seedlings.
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For substrate (propagating mixture) used in portrays/polybags mix
biopesticide Pseudomonas fluorescens
at 2 g/kg of substrate (cocopeat/ potting mixture) and fill in
portrays/polybags.
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For nursery beds drench with 3 lit of
Pseudomonas fluorescens suspension /
m2 (add
5ml or 5g of formulation / lit of water) before sowing seeds.
3. Bed treatment
Preparation
of main field before planting/ transplanting
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Enrichment of FYM with
bio-pesticides: Mix two kg each of
Paecilomyces lilacinus, Pseudomonas fluorescens
and Trichoderma harzianum / T. viride
in one ton of FYM and leave it in shade for 15 days at 25 – 30% moisture
for multiplication of beneficial microbes.
Soil has to be incorporated with 20 – 30 tons of
FYM enriched with bio-pesticides before planting/ transplanting seedlings.
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| Substrate & nursery bed treatment with
biopesticides |
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Application in standing crop
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Enrich neem cake with
bio-pesticides: Mix two kg of each of
Paecilomyces lilacinus, Pseudomonas fluorescens
and Trichoderma harzianum / T. viride
in one ton of neem cake and leave it in shade for 15 days at 25 – 30%
moisture for multiplication of beneficial microbes.
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Apply neem cake enriched with
biopesticides in standing crop at 50 g/ m2
once in a month.
·
Mix 20 kg of enriched neem cake mixture in
200 lit water, leave it for two days and this can be used for
drenching beds @ 2 lit/ m2 or filter it thoroughly and use it for
spraying the foliage or sending along the drip, once in a month.
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Biopesticides enriched neem cake suspension
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Spray Arka Plant Growth Promoter and Yield Enhancer (Pseudomonas
fluorescens + Trichoderma harzianum) at 5 ml or 5g/lit, once in a
month.
Or send
along the drip, Arka Plant Growth Promoter and Yield Enhancer (Pseudomonas
fluorescens + Trichoderma harzianum)
at 5 ml or 5g/lit, once in a month.
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Onion field showcasing the effect of bio-pesticides
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