Disease management : Anthracnose

Symptoms: Anthracnose is manifested in symptoms as die-back, twig blight, wither tip and fruit spot. On the unripe fruits small, dark brown, sunken and small spots of pin head size are observed. These spots gradually enlarge to 5 – 6 mm in diameter; coalesce to form a corky hard lesion having cracks. The ripe fruits become soft and at times drop off. Unopened buds and flowers are also shed. Foliage develops necrotic gray lesion at tips and margins. Tender branches dry from tip downward exhibiting ‘die back’. The growing tips of the branches die and necrotic and dead areas spread downwards. The leaves, flowers and fruits are sh3ed and unripe fruits remained mummified. Fruits carry the incipient infection from the field that manifests itself in storage causing rotting of fruits.

Epidemiology: The disease is mostly favoured by high humidity. During moist weather profuse production of acervuli is noticed on dead parts of twigs and the spores come out as a pinkish mass. These are further disseminated by rain or wind and cause fresh infection. The disease develops more rapidly on the ripe fruits and maximum spreads takes place at 30 °C and relative humidity of 96%.

Management: Sprayings of Bordeaux mixture (3:3:50) or Copper oxychloride (Blitox 0.2%) at weekly intervals starting from the month of July manage the disease. Among systemic fungicides Carbendazim (Bavistin 0.1%) or Thiophanate methyl (Topsin M or Roko 0.1%) provide effective disease control.



Guava general information

Guava (Psidium guajava L) of the myrtle family (Myrtaceae), is the fifth most widely grown fruit crop in India after banana, mango, citrus and papaya. The fruit has gained considerable prominence in India due to its high nutritive value, moderate prices, pleasant aroma and good flavour. Guava is a rich source of vitamin C and pectin and moderate source of B vitamins, calcium, iron and phosphorus. It is one of the commonest fresh fruits liked by the rich and the poor alike and is popularly known as the ‘apple of tropics’ or `poor man’s apple’. Only a small quantity of the production is utilized for processing in the form of jelly, canned cups, juice and nectar, cheese, toffee bar, powder, flakes and strained baby foods have also been prepared besides commercial pectin.

Contact us.

  • ICAR - IIHR.
  • Indian Institute of Horticultural Research, Hessaraghatta Lake post, Bengaluru - 560 089.
  •   Phone +91-80 23686100. website : www.iihr.res.in