Articles
Incidence, pathogenicity and control of fruit spots in major citrus growing areas of Nigeria
Article number
1348_32
Pages
233 – 238
Language
English
Abstract
Fruit spot is a major constraint to the production of citrus in Nigeria.
However, its incidence and pathogenicity have not been determined nor control measures developed.
Thirty-eight locations in 11 major citrus producing states viz., South-West (Oyo, Osun, Ondo and Ogun), North Central (Kogi, Nasarawa and Benue) South-East (Enugu and Anambra) and South-South (Edo and Delta) were assessed for fruit spots disease prevalence.
Ten citrus trees were randomly selected per location with 10 fruits sampled per tree.
Incidence of fruit spot was rated on a scale of 0-4. Efficacies of 2 synthetic fungicides (Red force and Hat-trick) and 2 bio-pesticides (NIHORT-Lyptol and Neem force) were tested in vitro on the causal pathogens (Colletotrichum gleoesporoides and Lasiodiplodia pseudotheobromae). Data were collected on radial growth and mycelia inhibition and subjected to analysis of variance (ANOVA). Means were separated using the Student-Newman-Keuls (SNK) at P≤0.05. Highest disease incidence occurred in Nasarawa (76.67%) and Osun (75.00%) states.
Moderate infection of 39.17, 26.67, 40.00 and 26.67% incidence was recorded in Oyo, Ondo, Benue and Kogi states, respectively.
Mild infection (11.67%) was observed in Ogun state.
Incidence was absent in Edo, Enugu, Delta and Anambra states.
Radial growth and mycelia inhibition of C. gloeosporioides by NIHORT-Lyptol was significantly (P≤0.05) higher (84.0%) than Hat-trick (73.0%), Redforce (70.0%) and Neem force (27.0%). Highest mycelia inhibition of 65.0% was observed both in L. pseudotheobromae treated with either NIHORT Lyptol or Hat-trick while the lowest mycelial inhibition (11.0%) was recorded in Neem force.
Fruit spot disease was confirmed in citrus producing areas of Nigeria.
NIHORT-Lyptol compared favourably with Hat-trick in its potential control of the diseases.
However, its incidence and pathogenicity have not been determined nor control measures developed.
Thirty-eight locations in 11 major citrus producing states viz., South-West (Oyo, Osun, Ondo and Ogun), North Central (Kogi, Nasarawa and Benue) South-East (Enugu and Anambra) and South-South (Edo and Delta) were assessed for fruit spots disease prevalence.
Ten citrus trees were randomly selected per location with 10 fruits sampled per tree.
Incidence of fruit spot was rated on a scale of 0-4. Efficacies of 2 synthetic fungicides (Red force and Hat-trick) and 2 bio-pesticides (NIHORT-Lyptol and Neem force) were tested in vitro on the causal pathogens (Colletotrichum gleoesporoides and Lasiodiplodia pseudotheobromae). Data were collected on radial growth and mycelia inhibition and subjected to analysis of variance (ANOVA). Means were separated using the Student-Newman-Keuls (SNK) at P≤0.05. Highest disease incidence occurred in Nasarawa (76.67%) and Osun (75.00%) states.
Moderate infection of 39.17, 26.67, 40.00 and 26.67% incidence was recorded in Oyo, Ondo, Benue and Kogi states, respectively.
Mild infection (11.67%) was observed in Ogun state.
Incidence was absent in Edo, Enugu, Delta and Anambra states.
Radial growth and mycelia inhibition of C. gloeosporioides by NIHORT-Lyptol was significantly (P≤0.05) higher (84.0%) than Hat-trick (73.0%), Redforce (70.0%) and Neem force (27.0%). Highest mycelia inhibition of 65.0% was observed both in L. pseudotheobromae treated with either NIHORT Lyptol or Hat-trick while the lowest mycelial inhibition (11.0%) was recorded in Neem force.
Fruit spot disease was confirmed in citrus producing areas of Nigeria.
NIHORT-Lyptol compared favourably with Hat-trick in its potential control of the diseases.
Publication
Authors
E.I. Nwanguma, E.O. Oyedeji, A.O. Oke, V.C. Umeh, V.A. Chikaleke, B.N. Okafor, O.O. Alamu, R.B. Ibe, R.K. Egberongbe, O. Arogundade, B.O. Oyewole, O.O. Oso, C.G. Elum
Keywords
Colletotrichum gleoesporoides, Lasiodiplodia pseudotheobromae, severity, synthetic fungicides, bio-pesticide
Groups involved
- Division Plant Genetic Resources, Breeding and Biotechnology
- Division Tropical and Subtropical Fruit and Nuts
- Division Temperate Tree Fruits
- Division Temperate Tree Nuts
- Division Vine and Berry Fruits
- Division Ornamental Plants
- Division Vegetables, Roots and Tubers
- Division Plant-Environment Interactions in Field Systems
- Division Greenhouse and Indoor Production Horticulture
- Division Postharvest and Quality Assurance
- Division Precision Horticulture and Engineering
- Division Horticulture for Human Health
- Division Horticulture for Development
- Division Landscape and Urban Horticulture
- Commission Banana
- Commission Cultivar Registration
- Commission Agroecology and Organic Farming Systems
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