Susceptibility of guava genotypes to natural infestation by Anastrepha spp. (Diptera: Tephritidae) in the municipality of Monte Alegre do Sul, State of Sao Paulo, Brazil

Susceptibility of guava genotypes to natural infestation by Anastrepha spp. (Diptera: Tephritidae) in the municipality of Monte Alegre do Sul, State of Sao Paulo, Brazil

The infesting species and their infestation indices of fruit flies were determined for eleven guava genotypes (Psidium guajava L.). From March to April 2000, ten mature fruits of each genotype were harvested at weekly intervals from insecticide unsprayed trees located in the municipality of Monte Al...

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Bibliographic Details
Published in:Neotropical entomology Vol. 35; no. 1; pp. 121 - 125
Main Authors: Raga, A, Souza Fiho, M.F. de, Azevedo Filho, J.A. de, Sato, M.E
Format: Journal Article
Language:English
Published: Netherlands Sociedade Entomológica do Brasil 01-01-2006
Subjects:
Anastrepha
Animals
Braconidae
Brazil
ENTOMOLOGY
fruit flies
fruit fly
genetic variation
Genotype
guavas
host plants
infestation index
insect pests
Insecta
mosca-das-frutas
Myrtaceae
pest resistance
plant pests
plant-insect relations
Psidium - genetics
Psidium - parasitology
Psidium guajava
Tephritidae
índice de infestação
Brazil
Psidium guajava
fruit fly
infestation index
Insecta
Myrtaceae
mosca-das-frutas
índice de infestação
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Summary:The infesting species and their infestation indices of fruit flies were determined for eleven guava genotypes (Psidium guajava L.). From March to April 2000, ten mature fruits of each genotype were harvested at weekly intervals from insecticide unsprayed trees located in the municipality of Monte Alegre do Sul, SP, Brazil. Fruits were brought to the laboratory, weighed and placed in individual plastic cups containing sand at the bottom to obtain the tephritid pupae. About 95% of guavas produced fruit fly puparia. Of the 682 Anastrepha females recovered, four species were identified: A. fraterculus (Wied.) (86.5%), A. obliqua (Macquart) (10.8%), A. bistrigata Bezzi (1.8%) and A. sororcula Zucchi (0.9%). Three species of parasitoids Braconidae (Opiinae) were recovered: Doryctobracon areolatus (Szepligeti), Doryctobracon brasiliensis (Szepligeti) and Utetes anastrephae (Viereck). The genotypes differ in level of infestation depend on the collecting time. The genotypes 'L2P4 Vermelha', 'Ruby Suppreme' and 'Webber Suppreme' showed the lowest susceptibility to tephritids in terms of puparia per fruit. The variability of infestation among the guava genotypes and the reasons for increasing fruit fly infestations along the time were discussed.
Bibliography:10.1590/S1519-566X2006000100016
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2006000100016
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1519-566X
1678-8052
1678-8052
DOI:10.1590/S1519-566X2006000100016