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1. Local Name: Limau langkat, Limau Batu, Limau Jepun
2. Varietal Recommendation
(i) Limau mandarin:
Bidin - Big fruit, sweet and a good yielder
Kong Ho - Good sized fruit, sweet and a heavy yielder
(ii) Mandarin Honey Orange:
Johor Honey - Sweet-sour taste, good aroma and a heavy yielder
3. Spacing: 5.5 m x 5.5 m
4. Planting Material:
Recommended rootstocks are Carrizo citrange and Cleopatra Mandarin.
5. Manuring
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Year
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Time of Application
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Type of Fertilizer
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Rate /
Application
(kg)
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0
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At planting |
Rock Phosphate
Dolomite
Tahi Ayam |
0.20
0.10
5
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0.20
0.10
5.0
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1
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Every 3 months |
15:15:15 |
0.5
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0.13
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2
|
Every 3 months |
15:15:15 |
1.5
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0.38
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3
|
Every 3 months |
12:12:17:2+TE |
2.5
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0.63
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4
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Every 4 months |
12:12:17:2:TE |
4.0
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1.33
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5
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Every 4 months |
12:12:17:2:TE |
5.0
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1.67
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6 above
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Every 4 months |
12:12:17:2:TE |
6.0
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2.00
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In addition, orgamic manure at 10-30 kg/tree/year and dolomite at 0.2 to 0.3 kg/tree/year is recommended.
6. Pruning
The young trees should be pruned at one year to form an open, well-balanced canopy. Each should have only a single trunk with three or four well-distributed primary branches originating at different points from 30 to 60 cm above ground level.
7. Fruit Thinning
Common practice is to allow one or two fruit per twig, thinned when the fruits are less than marble size.
8. Vegetitative Stage: 3 years
9. Economic Life: 20-25 years
10. Harvesting and Yield
- 4 - 5 years - yield: 5 - 7 mt/ha/year
- 8 years and above - yield: 20 - 30 mt/ha/year
11. Pest and Disease Control
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| 1. Fruit Fly |
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Infestation of fruits commences with the female making a punchure in the fruit skin when it lays eggs. The larva feeds inside the fruit causing it to rot. |
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- Collect and destroy damaged fruits
- Bagging of fruits with paper bags
- Trapping of fruits with methyl eugenol to reduce the male population
- Spray with dimethoate or deltamethrin or fenthion.
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2. Psyllid limau
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Both nymph and adult suck sap from young leaves and shoots, resulting in curling of leaves and stnted growth of plants. Honey dew secreted during feeding result in sooty mold. Insect is a vector of citry greening disease. |
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Spray with dimethoate or malathion during the on-set of new flushes before the fruiting season. |
| 3. Fruit borer |
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It is common in pomelo. Frass and gummy liquid oozing out are the obvious symptoms on the rind. Attacked fruits fall off prematurely. |
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- Bagging of fruits
- Destroy infested fruits
- Spray with pyrethroids, dimethoate, acephate or fenthion
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4. Leaf miner
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Newly hatched larvae bore into the epidermal tissue of the leaf and live inside by burrowing silvery coiled mines on them. Damaged leaf is distorted or curled up resulting in stunted growth. |
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- Pluck infested leaves and destroy
- If necessary, spray with petroleum spray oils (e.g D-C.Tron Plus), acephate or diazinon.
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| 5. Citrus Bug |
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Adults and nymphs suck sap from fruits, young shoots and leaves. Affected fruit turn brown at points of feeding and drop prematurely. Shoots wilt and shrivel. |
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- Hand pick the nymphs
- Spray with acephate or dimethoate or fenthion if necessary.
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| 6. Lemon Caterpillar |
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Larva eats up a leaf in a few minutes leaving only the midrib. Feeding impairs growth of young plants. |
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Hand pick and destroy
Spray with any common insecticide if necessary
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| 7. Aphid |
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They suck sap from young shoots causing yellowing and curling or distorted growth. |
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Spray with malathion and albomineum. |
| Top |
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