This document discusses several diseases that affect guava plants and their management. It describes the algal leaf spot disease caused by Cephaleuros virescens, which produces orange-rust colored tufts on leaves. It also discusses anthracnose caused by Colletotrichum gloeosporoides which causes sunken dark lesions on fruit. Finally, it discusses rust caused by Puccinia psidii which produces orange-red pustules on leaves and fruit. The document provides details on the symptoms and management recommendations for each disease, which include using resistant varieties, fungicide applications, improving sanitation and fertilization.

1. My Introduce
Name : Md. Rafiqul Islam
ID : 16109015
Program : BSAg
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2. Disease of Guava and its
Management
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3. Introduction
• Guava is a common fruit in our country.
Its scientific name is Psidium guajava.
Guava is good sources of vitamin-C and
minerals. 100 g fresh fruit provides 228
mg of vitamin-C, more than three times
the required daily recommended intake.
Some disease and management about
guava are given bellow.
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4. Disease name : Algal leaf spot
Pathogen name: (Cephaleuros virescens)
SYMPTOMS
• Orange, rust-colored,
dense, silky tufts on
both upper and lower
surfaces of leaves
which turn reddish-
purple in color as they
mature.
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5. Continue
• If tufts are scraped away, a thin gray-
white or dark-colored necrotic spot
remains on the leaf; bark on twigs and
branches may be cracked; young stems
and fruit may also be attacked.
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6. MANAGEMENT
• Ensure trees receive adequate
fertilization, irrigation.
• promote air circulation through the
canopy; periodic applications of a
copper based fungicide is usually
enough to control the disease.
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7. Disease name : Anthracnose
Pathogen name : ( Colletotrichum
gloeosporoides)
SYMPTOMS
• Sunken, dark colored
lesions on mature fruit
which may become
covered in pink spores;
lesions coalesce to form
large necrotic patches on
surface of fruit.
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8. MANAGEMENT
• Use resistant variety of guava .
• Both systemic and non-systemic
fungicides are effective at
controlling the disease and are
usually applied shortly before
flowering and during fruit
development.
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9. Disease name : Rust (fungal)
Pathogen name : Puccinia psidii
SYMPTOMS
• Orange to red pustules
appearing on leaves, young
shoots, flowers and/or fruit;
• leaves distorted; defoliation
of tree; reduced growth;
circular lesions on fully
expanded leaves with dark
borders and yellow halos.
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10. MANAGEMENT
• Application of appropriate
fungicides.
• Good sanitation practices .
• Adequate fertilization.
• Irrigation and pruning of trees.
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11. Disease name : Root knot
Pathogen name: Meloidogyne spp.
(nematode)
SYMPTOMS
• Galls on roots which can
be up to 3.3 cm (1 in) in
diameter but are usually
smaller; reduction in
plant vigor; yellowing
plants which wilt in hot
weather.
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12. MANAGEMENT
• Plant resistant varieties
• Check roots of plants mid-season or
sooner if symptoms indicate
nematodes.
• Solarizing soil can reduce nematode
populations in the soil and levels of
inoculums of many other pathogens.
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13. Conclusion
• We have already discussed about
plant disease and its management .we
should not depend on not only
chemical control but also cultural and
biological method for control plant
disease.
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14. Have any
Question
?3/28/2018 14

15. Thanks
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