comes up well in humid regions up to an elevation of
1000 m. Soil should be deep and well drained. Any rise
in water table or poor aeration of the soil is detrimental
to the crop.
Use seedlings or grafts for planting. For grafting,
raise seedlings in polythene bags and when they are
9-12 months old do inarching. One month after grafting,
behead the rootstock above the graft joint.
grafting can be undertaken successfully in jack. Three
to four month old, 10 cm long scions are grafted on
five-day old rootstocks in polythene bags by the cleft
method during the month of June and kept under moist
conditions. The scions should be pre-cured 10 days before
grafting by clipping the leaf blades and keeping the
petioles intact on the twig. The graft union is complete
by 80 days after grafting operations.
Jackfruit differs in size, shape and quality. The jackfruit
may be classified into two groups: (i) soft fleshed
and (ii) firm fleshed. The firm fleshed type is highly
tasty, sweet and crisp. The two groups are further classified
depending on the taste, size of fruit, odour of flesh,
nature, shape and diversity of prickles on the rind.
distinct types with desirable qualities recommended
for Kerala are:
1. Muttom varikka which is a firm fleshed, sweet scented
2. Singapore or Srilanka jack which is an introduced
variety from Srilanka. It bears fruits in 3 years after
planting and is extremely precocious in habit. The fruits
are more or less the same size as the common jackfruit.
A tree may yield as many as 250 fruits.
Plant seedlings or one year old grafts at the onset
of monsoon showers.
Prepare pits of size 60 x 60 x 60 cm at a spacing
of 12-15 m. Refill pits with mixture of topsoil and
10 kg compost or FYM per pit to a level higher than
the adjoining ground. Plant the grafts in the same
depth as they were in the containers, preferably in
the late evening. Deep planting results in poor growth
of the graft. Ensure that the graft joint is above
the soil level. Stake the plants to prevent snapping
at the graft joints. Excellent drainage and adequate
watering result in better performance. At no stage
it should be exposed to drought or frost. It is useful
to provide some protection, especially to young trees.
Jack is rarely manured. Even without fertilizer application,
the jack trees come up well under Kerala conditions.
important pests of jack are shoot borer caterpillar,
mealy bug and jack scale.
1. To control shoot borer caterpillars spray with any
2. To control jack scale apply contact insecticide.
3. To control mealy bug, spray contact insecticides
like lime sulphur or dust sulphur.
common diseases that attack the tree are the pink disease,
stem rot and fruit rot. Pruning of affected plants and
protecting the cut-ends with Bordeaux paste are recommended
against these diseases.
seedling plants generally bear after eight years and
the grafted plants after three years of planting. The
fruiting season lasts about four months from January-February
to May-June. The average yield from one tree is about
50-100 fruits per year.