
Anthracnose
Colletotrichum sp.
Pathogen:
Type:
Fungus
Risk:
HIGH

Frutos
Antracnosis

WHO CAUSES IT?
Colletotrichum sp. is a genus of phytopathogenic fungi comprising numerous species capable of causing disease in a wide variety of crops, especially fruits. Many species exhibit hemibiotrophic behavior, initiating colonization of living tissues relatively discreetly and subsequently progressing to a necrotrophic phase in which they destroy cells and cause visible lesions. The fungus develops a mycelium composed of hyphae that can grow on the surface and penetrate tissues. An important characteristic of many Colletotrichum species is the formation of specialized structures called appressoria, which allow the fungus to adhere firmly to the plant surface and exert mechanical pressure and enzymatic activity to penetrate the cuticle and access internal tissues. Infection can occur through directly penetrable tissues, although wounds, cracks, insect damage, and other lesions considerably facilitate pathogen entry. After becoming established, the fungus may initially remain inconspicuous, especially when the fruits have not yet reached maturity. As the infection progresses and the fruit ripens, the pathogen's activity may increase and become evident through the appearance of characteristic necrotic lesions. Acervuli, reproductive structures in which numerous conidia are produced, form in the affected areas. Conidia are generally hyaline and unicellular and constitute one of the main sources of pathogen propagation. When environmental conditions are favorable, conidia can germinate on the fruit surface and form germ tubes and appressoria. Surface moisture is especially important for germination and penetration to occur. Conidia can be released from the lesions by water and subsequently reach other susceptible fruits or tissues. Rain, sprinkler irrigation, water splash, tissue contact, and cultivation practices can all promote their dispersal. The pathogen can also survive between growing seasons in infected plant debris, affected fruit, and other contaminated materials, providing sources of inoculum for new infections. In certain species, infections can remain latent for a significant portion of fruit development and manifest themselves later during ripening or after harvest. This characteristic is especially relevant in fruits intended for storage and sale, since a fruit that appears healthy at harvest time can develop lesions during transport or storage.
SYMPTOMS
Anthracnose caused by Colletotrichum sp. primarily affects fruit and is characterized by the appearance of necrotic lesions that can develop rapidly under favorable temperatures and high humidity. The first signs of the disease appear as small, circular, slightly sunken spots of varying color, which subsequently increase in size and turn brown, reddish, black, or grayish depending on the Colletotrichum species and the affected fruit. As the infection progresses, the lesions can penetrate deeper into the tissues and cause extensive rot. Under high humidity, the lesions develop masses of viscous conidia that may exhibit orange, pink, or salmon hues, characteristic of many species within the genus. The disease can appear during cultivation but can also manifest after harvest, especially when the fruit reaches maturity. The progression of the lesions reduces the firmness, quality, and shelf life of the fruit and can cause significant losses when a high inoculum level is present. The disease can manifest itself through:
• Circular or irregular spots of brown, reddish, grayish, or black color.
• Slightly sunken or depressed lesions on the surface of the fruit.
• Small lesions that progressively increase in size.
• Necrosis of the affected tissues.
• Appearance of areas of soft or progressive rot.
• Formation of concentric lesions or lesions with clearly defined borders on some fruits.
• Appearance of masses of orange, pink, or salmon-colored conidia on the lesions under humid conditions.
• Cracks and deterioration of the epidermis in the affected areas.
• Progressive sinking of the tissues.
• Spread of the rot into the interior of the fruit.
• Loss of firmness and alteration of texture.
• Uneven ripening or accelerated deterioration of the affected fruits.
• Development of lesions during storage and transport. • Post-harvest rot that can continue to develop even if the fruit showed no obvious symptoms at harvest.
• Reduction in marketable quality and an increase in the percentage of discarded fruit.



TEMPERATURE AND HUMIDITY
20–30 °C
90–100 %
TRANSMISSION ROUTES
Conidia transported by wind, rain, water splashes, irrigation water, contact between fruits, infected plant debris, affected fruits, contaminated tools, agricultural machinery, contaminated harvesting boxes and materials, hands and clothing of workers, insects, wounds caused by pests, contaminated plant material.
Do you want to remove this disease? Choose how you want to treat it.
TREATMENTS
Chemical treatments
• AZOXISTROBIN 25% [SC] P/V
• CAPTAN 47.5% [SC] P/V
• CIPRODINIL 37.5% + FLUDIOXONIL 25% [WG] P/P
• FOLPET 50% [SC] P/V
• FOLPET 80% [WG] P/P
• METIRAM 70% [WG] P/P
• PIRACLOSTROBIN 6.7% + BOSCALIDE 26.7% (I) [WG] P/P
• CUPRIC HYDROXIDE 25% (EXPR. IN CU) [WG] P/P
• LAMINARIN 4.5% [SL] P/S
• COPPER OXYCHLORIDE 35% (exp. in Cu) [WG] P/P
• COPPER OXYCHLORIDE 38% (EXPR. IN CU) [SC] P/V
• COPPER OXYCHLORIDE 50% (EXPR. IN CU) [WP] P/P
• COPPER OXYCHLORIDE 52% (EXPR. IN CU) [SC] P/V
• CUPROCALCIC SULFATE 20% (EXPR. IN CU) [WG] P/P
Authorized treatments in organic farming
• CUPRIC HYDROXIDE 25% (EXPR. IN CU) [WG] P/P
• LAMINARIN 4.5% [SL] P/S
• COPPER OXYCHLORIDE 35% (exp. in Cu) [WG] P/P
• COPPER OXYCHLORIDE 38% (EXPR. IN CU) [SC] P/V
• COPPER OXYCHLORIDE 50% (EXPR. IN CU) [WP] P/P
• COPPER OXYCHLORIDE 52% (EXPR. IN CU) [SC] P/V
• CUPROCALCIC SULFATE 20% (EXPR. IN CU) [WG] P/P
Biological control
• BACILLUS SUBTILIS (STRAIN QST 713) 1.34% [SC] P/V
Recommendations
• Remove affected fruit and infected plant debris to reduce sources of inoculum present in the plot. • Remove fallen or mummified fruit that may remain on the ground and act as a reservoir for the pathogen.
• Avoid leaving overripe fruit on the plants, as mature tissues may be more susceptible to certain Colletotrichum species.
• Reduce wounds and mechanical damage during agricultural work, harvesting, and fruit handling.
• Avoid insect damage, as wounds can facilitate pathogen penetration.
• Maintain good aeration of the vegetation through proper crop structure management.
• Avoid excessive vegetation density that hinders fruit drying after rain or irrigation.
• Reduce the time the fruit remains wet.
• Avoid overhead irrigation whenever possible, especially during periods of high disease pressure.
• Schedule irrigation to avoid prolonged surface moisture on the fruit.
• Maintain proper hygiene. Tools, equipment, boxes, and surfaces used during harvesting and handling.
• Avoid transporting or storing healthy fruit together with fruit showing suspicious lesions.
• Select and remove any fruit with wounds, lesions, or signs of infection during sorting.
• Handle fruit carefully during harvesting to avoid bruising, cuts, abrasions, and other injuries.
• Maintain suitable storage conditions that reduce condensation and surface moisture on the fruit.
• Pay special attention to crops during periods of high temperatures and persistent humidity.
• Conduct frequent inspections to detect the first lesions and prevent excessive inoculum multiplication.
• Apply fungicides authorized for the crop and specifically for the control of Colletotrichum, following the doses, intervals, and maximum number of applications indicated on the label.
• Apply preventively or at times of highest risk when indicated by the authorized product and the control strategy, avoiding reliance solely on curative treatments.
• Alternate active ingredients belonging to different groups Mode of action to reduce selection pressure on pathogen populations.
• Avoid consecutive or repeated applications of active ingredients with the same FRAC group when authorized alternatives exist.
• Strictly adhere to recommended doses and avoid reducing doses below those indicated on the label.
• Limit the number of applications of active ingredients with a higher risk of resistance selection.
• Integrate chemical treatments with cultural, hygiene, and moisture management practices.
• Use healthy plant material and avoid introducing contaminated fruit or debris into pathogen-free plots.
• Properly disinfect equipment and tools when there is a risk of transporting infected plant material between plots.
• Avoid moving contaminated plant debris from diseased areas to healthy areas during agricultural work.
• Maintain an integrated management strategy that reduces the amount of inoculum and decreases the need for repeated fungicide applications.
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*The recommended treatments are recommendations based on the authorities' databases and do not replace in any way the guidelines established by the legislation of each country.
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TREATMENTS
Homemade remedies
There are no home treatments
Natural allies
Chemical treatments
There are no treatments for this disease. Treatments are directed at the insect vectors that transmit it. See insect treatments.
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