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28 December 2024
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മലയാളം
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Agriculture > Fruit
Crops > Pineapple (Ananas comosus)
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Crop
Management
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Plant Protection-Kew
No serious pests or diseases are noticed in the crop except for light incidence
of leaf spot disease and mealy bugs.
Mealybug infestation
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Association of ants
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Mealybug wilt
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with mealybugs
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Mealybugs (Dysmicoccus sp.) infest commercial pineapple plantings,
affecting pineapple production in several ways. The rapid spread of this malady
in the field is largely due to the feeding habit of bugs. Symptoms first appear
on roots which cease to grow, eventually leading to collapse of tissues. Feeding
of Dysmicoccus species on pineapple produces a toxic effect called mealybug
stripe, expressed as green or black striped areas. The most predominant symptom
is wilting of leaves, commencing from leaf tips. Reddish-yellow colour develops
in the wilting areas. Finally the plants rot and develop decaying suckers. Fruits
developed are undersized. Ants of several species act as carriers of mealy bugs.
Management:
For control of mealy bugs, adopt the following measures: Apply quinalphos at 0.05%.
Destroy grasses and other monocot weeds, which serve as alternate hosts for the
pest.
Leaf Spot
Leaf spot occurs frequently in moist and warm climate. Small water soaked
areas developed on leaves, which gradually enlarge. The affected portions
become pale yellow in colour and gradually dry up. This disease is caused
by Phytophthora spp.
Management:
For control of leaf spot, spray with any one of the following fungicides when symptoms
of the disease are noticed:
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Bordeaux mixture
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1%, 225 litres / ha
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Zineb
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1 kg in 225 litres of water / ha
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Mancozeb
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1 kg in 225 litres of water / ha
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