Informational
Figure 1. A) Queen pineapple with Heart rot disease and B) Phytophthora cinnamomi under a microscope (100x)
A. Heart rot and root rot
• Causal Organism: Phytophthora cinnamomi
• Symptoms: soft rotting of the basal white tissues of the youngest leaves at the heart of the apical meristem; necrosis (Green and Nelson, 2015; Ceniza et al, 2018)
• Economic Importance: most destructive soil-borne pathogen with 20-30% prevalence (Shen et al., 2013)
• Distribution: As surveyed, it was observed in Ormoc City, Leyte and Silago, Southern Leyte
a. Management Options: Integration of regulatory, cultural, chemical, and biological practices (Green and Nelson, 2015); Use of antagonists Trichoderma and Penicillium sp. (Oclarit, 2018)
Figure 2. A) Queen pineapple leaves with anthracnose disease, B) Colletotrichum gloeosporioides under microscope (100x)
B. Anthracnose
• Causal Organism: Colletotrichum gloeosporioides
• Symptoms: dark, water-soaked lesions on leaves (Kumar, 2014; Ceniza et al, 2018)
• Economic importance: wide host range: coconut, mango, banana, avocado, papaya, etc. (Nelson 2008)
• Distribution: As surveyed, it was observed in Baybay City, Javier, Leyte, and Silago, Southern Leyte
a. Management Options: Carry out regular weeding and timely pruning of the infected plant parts; Plant resistant varieties (Waller, 1992); use of wood vinegar (Torres, 2018); use of plant extracts (Payot, 2018)
Figure 3. A) Queen pineapple leaves with leaf blotch, B) Pestalotia sp. under a microscope (100x)
C. Leaf Blotch
• Causal Organism: Pestalotia
• Symptoms: chlorotic, water-soaked flecksthat enlarge to become dry, yellow, then red-brown, blocky to oval lesions (IPCM, 2013; Alegre et al, 2018)
• Economic Importance: Affects photosynthesis of the plant (Alegre et al, 2018)
• Distribution: It was observed pineapple fields in the Municipality of Basud and San Vicente, Camarines Norte (Alegre et al, 2018)
a. Management Options: Crop rotation, proper crop debris management, and fungicide treatments (IPCM, 2013)
Figure 4. A) Queen Pineapple with blight disease; B) Fusarium sp. under microscope (400x)
D. QP Blight
• Causal Organism: Fusarium
• Symptoms: Drying of leaves, noticeable loss of vigor and severe injury to the vascular level (Alegre et al, 2018)
• Economic Importance: Death of plants (Alegre et al, 2018)
• Distribution: It was observed in San Lorenzo Ruiz, San Vicente, Basud, Bibirao and Calasgasan, Camarines Norte (Alegre et al, 2018)
a. Management Options: Crop rotation, proper crop debris management, and fungicide treatments (IPCM, 2013)
Figure 5. A) Queen pineapple with leaf spot; B) Curvularia sp. under a microscope (100x)
E. QP Leaf Spot
• Causal Organism: Curvularia
• Symptoms: Yellow, brown lesions which eventually turns dark on QP leaves (Alegre et al, 2018)
• Economic Importance: Affects photosynthesis of the plant if severe could result to death of plant (Alegre et al, 2018)
• Distribution: It was observed in San Lorenzo Ruiz, San Vicente, Basud, Bibirao and Calasgasan, Camarines Norte (Alegre et al, 2018)
a. Management Options: Crop rotation, proper crop debris management, and fungicide treatments (IPCM, 2013)
Figure 1. Queen Pineapple fruit infested with PPMB
Description
- Pink pineapple mealybug, Dysmicoccus brevipes Cockerell (PPMB), is one of the major pests of pineapple [Ananas comosus (L.) Merrill].
- Belongs to Family Pseudococcidae and described as cottony, small, oval and soft-bodied sucking insect (Joy, et al., 2013).
- Feeds on the fruits, roots, stem, and leaves of the plant (Ceniza et al, 2018)
- Dispersed by ants (Joy et, 2013) because PPMB secreteS sweet and sticky liquid called honeydew as a by-product of its feeding (Rohrbach and Johnson, 2003).
- Distribution: Baybay City, Javier, Ormoc City, Villaba in Leyte; Silago in Southern Leyte; San Lorenzo in Camarines Norte (QP Project 4)
College of Agriculture and Food Science
Department of Agricultural Education and Extension
Department of Development Communication
Department of Food Science and Technology
Department of Plant Breeding and Genetics
College of Arts and Sciences
Department of Biological Sciences
Department of Arts,Languages and Literature
Department of Philosophy and Social Sciences
Department of Pure & Applied Chemistry
College of Education
Department of Teacher Education
College of Engineering
Department of Agricultural Engineering
College of Forestry and Environmental Sciences
Institute for Tropical Ecology and Environmental Management
College of Management and Economics
Department of Business Management
Institute of Strategic Research and Development Studies
Department of Pure & Applied Chemistry
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Elizabeth S. QuevedoAssociate Professor V |
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Felix M. SalasProfessor VI |
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Edgardo E. TulinUniversity President |
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James A. PatindolAssociate Professor V |
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Allan A. RamalAssociate Professor V |
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Genesis AlbaricoInstructor II |
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Mark Ryan R. TripoliInstructor I |
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Department of Mathematics, Physics and Statistics
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Norberto E. MillaAssociate Professor IV |
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Edilberto Gonzaga Jr.Assistant Professor I |
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Department of Liberal Arts and Behavioral Sciences
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Annie A. ParmisAssociate Professor IV |
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Seregena Ruth L. MartinezAssociate Professor V |
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Rhodora Abalajen-BandeAssociate Professor I |
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Michael Carlo C. VillasAssistant Professor IV |
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Maria Vanessa E. GabunadaAssociate Professor III |
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Cherry N. RolaAssociate Professor II |
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Sheena Mae P. LubrioAssistant Professor II |
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Daisy P. AcoritayAssistant Professor I |
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Bethlehem A. PonceAssociate Professor II |
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Institute of Human Kinetics
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Joselle R. CayetanoAssociate Professor I |
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Florife A. GatchalianAssociate Professor IV |
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Charis L. RiveraAssociate Professor V |
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Andrew A. MazoAssistant Professor I |
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Sheena Eunice B. TabudlongAssistant Professor I |
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Mary Jean M. SapanAssociate Professor I |
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Aleli A. VillocinoAssociate Professor V |
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Dennis Joel L. CernaInstructor I |
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Kevin R. SumayangInstructor I |
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Irish N. CatacutanInstructor I |
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Department of Teacher Education
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Rosario P. AbelaAssociate Professor V |
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Ma. Rachel Kim L. AureAssociate Professor V |
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Bayron S. BarredoAssociate Professor IV |
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Joy A. BellenAssociate Professor II |
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Marilyn N. ManaigAssociate Professor IV |
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Joel Q. MabalhinAssociate Professor II |
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Leo A. MamoloProfessor IV |
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Shalom Grace S. VegaAssociate Professor IV |
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Mark Gil A. VegaAssistant Professor IV |
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Department of Liberal Arts and Behavioral Sciences
GRADUATE FACULTY
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Annie A. ParmisAssociate Professor IV |
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Seregena Ruth L. MartinezAssociate Professor V |
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Rhodora Abalajen-BandeAssociate Professor I |
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Michael Carlo C. VillasAssistant Professor IV |
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Maria Vanessa E. GabunadaAssociate Professor III |
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Cherry N. RolaAssociate Professor II |
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Sheena Mae P. LubrioAssistant Professor II |
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Daisy P. AcoritayAssistant Professor I |
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J-Annie G. EbitAssistant Professor II |
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