TNAU Agritech Portal
  Home | About Us | Success Stories | Farmers Association | Farmers' Innovation | Publications | Contact

Horticultural crops :: Plantation :: Rubber

  1. Abnormal leaf fall – Phytophthora palmivora& P. nicotianae var. parasitica
  2. Secondary leaf fall – Glomerella cingulata
  3. Birds eye spot – Drechslera heveae (Helminthosporium heveae)
  4. Corynespora leaf spot – Corynespora cossicola
  5. Pink disease – Corticium salminicolor
  6. Powdery mildew – Oidium heveae
  7. Brown root diseases - Fomes noxius
  1. Abnormal leaf fall – Phytophthora palmivora& P. nicotianae var. parasitica

Symptoms:

  • It occurs during June – August, while general leaf fall occurs during December.
  • On leaves dull grey, circular spots appear which enlarge and become irregular.
  • The  petiole exhibit sunken spot. Affected fruits rot. Leaves shed prematurely either green or after turning coppery red.
  • The affected leaf form a thick carpet of rotting foliage which emits bad smell.

Management:

  • Prophylactic sprays prior to onset of south west monsoon with Bordeaux mixture 1%. Addition of ZnSo4 @ 0.2% improves the efficacy.
  1. Secondary leaf fall – Glomerella cingulata

Symptoms:

  • Numerous minute circular brown spots appear on leaves which turn into grey spots with brown margin
  • The spots coaleses and dry up. Leaves crinkle and shed prematurely. Green pods which are affected become rotted.

Management:

  • Spraying with 1% Bordeaux mixture

 

  1. Birds eye spot – Drechslera heveae (Helminthosporium heveae)

Symptoms:

  • Circular spots with grey centre and with brown border occur in large number in nursery or on young plants in the field.

Management:

  • Spray with 1% Bordeaux mixture
  1. Corynespora leaf spot – Corynespora cossicola

Symptoms:

  • Circular spots with brown or papery centre and with a dark brown ring appear on the young leaves.
  • An yellow hallo develop around the ring. Short holes occur. Affected leaves dries up.

Management:

  • Spray with 1% Bordeaux mixture
  1. Pink disease – Corticium salminicolor

Symptoms:

  • Prevelent  in wet areas. Young twigs and branches are mostly affected.
  • The fungal growth encircles the stem penetrate the bark and cartical tissues which eventually decay.
  • The park splits and peals off. If the infection in not recognized early the tree is killed after the rainy season.

 

 

Management:

  • Affected parts should be pruned and burn and pasting with Bordeaux paste or painting tar.
  • Copper fungicides should not be used in rubber because they will be contaminated in latex.
  1. Powdery mildew – Oidium heveae

Symptoms:

  • White powdery fungal growth appears on young leaves and also on matured leaves.
  • Infected leaves curl, crinkle, role inwards and fall off leaving the petiole attached to the tree giving a broom stick appearance.
  • The infected flowers and tender fruits shed.

Management:

  • Dusting with sulphur   3-5 spray at 15 days interval.
  • Carbendazim 0.1% or Tridemorph 1.5% dusting alternated with sulphur dust 70%
  • Carbendazim +wettable sulphur and microsul (52% EC) is also effective.
Leaf symptom
Severely affected leaf
  1. Brown root diseases -  Fomes noxius

Symptoms:

    • The affected roots are encrusted with mass of soil and small stones held by net work of mycelium.
    • The affected tap root becomes rotted and the entire tree is killed.

Management:

    • Removal and destruction of the infected trees.
    • Apply lime @ 2.5t/ha
    • In the area of dead tree apply additional dose of lime @ 25 kg/ dead tree.
    • Wash the partially affected root with Emisan or Aretan 0.1%.

Home | About Us | Success Stories | Farmers Association | Publications | Site Map | Disclaimer | Contact Us

© 2014 TNAU. All Rights Reserved.