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Monthly Archives: June 2014

coconut

DAMAGE CHARACTERISTIC

• Infect both young and old palms; affects
the leaves thereby reducing the
photosynthetic activity of palms

• During severe infection, seedlings
become unfit for field planting

• Generally, the fungi are weak parasites
that thrive on poorly nourished palms
which are physiologically weak to resist
fungal infection.

APPEARANCE

• Leaf spot caused by
Pestalozzia
palmarum
Cke. & Grev. Appear first as
small yellowish brown, circular to oblong
spots on leaflet. Spots gradually turn
brown with ashen gray center surrounded
by dark brown bands. Spots enlarge and
fuse making the leaf appear blighted or
burnt.

Spots enlarge and fuse making the leaf appear
blighted or burnt

Conidia of
P. palmarum

• Leaf spot caused by
Helminthosporium
sp. are small, dark brown sunken necrotic
. Spots gradually enlarge to form blight

DISEASE MANAGEMENT PRACTICES

Prevention

Practice proper cultural management
to prevent leaf spot.

• Space seedling at 60 x 60 cm triangular
distance to provide adequate room for
developing palms.

• Prune and collect damaged leaves and
burn severely infected seedlings in
nursery.

Prune damaged leaves and burn

• Do not overgrow seedlings in nursery,
overcrowding predisposes young palms to
infection.

• Fertilized the seedlings to improve their
vegetative growth, vigor & resistance to
the disease.

Small yellowish brown, circular to oblong spots
on leaves initial symptom of disease
Control

• Apply recommended fertilizer both for
coconut seedlings and field planted palms.

Severely infected palm with leaf spot (without
fertilizer)

Palms with healthy growth and no leaf spot
(with fertilizer)

• Spray fungicides such as Vitigran Blue,
Captan 500, Daconil 2787 at 3tbsp per
gallon of water every 15 days for leaf spot
still occurring despite fertilizer application

Spraying of Fungicides