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Agriculture > Fruit Crops > Pineapple (Ananas comosus)

Crop Management

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

Association of ants
Mealybug wilt
with mealybugs

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:

Bordeaux mixture : 1%, 225 litres / ha
Zineb : 1 kg in 225 litres of water / ha
Mancozeb : 1 kg in 225 litres of water / ha

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