Data/hora: 23/06/2024 04:25:14

Biblioteca(s): | Embrapa Mandioca e Fruticultura.
Data corrente: | 30/10/1995
Data da última atualização: | 30/10/1995
Autoria: | YANG, Y.; ALLEN, J. C.; KNAPP, J. L.; STANSLY, P. A.
Afiliação: | Department of Entomology, University of Florida, Gainesville, FL 32611.
Título: | Frequency distribution of citrus rust mite (Acari: Eriophydae) damage on fruit in `hamlin' orange trees.
Ano de publicação: | 1995
Fonte/Imprenta: | Environmental Entomology, v.24, n.5, p.1018-1023, 1995.
ISSN: | 0046-225x
Idioma: | Inglês
Conteúdo: | Frequency distribution of the citrus rust mite, Phyllocoptruta oleivora (Ashmead), dumage on `Hamlin' orange citrus sinesis fruit was studied from 24 august to 13 October 1993, in Lake Alfred, FL. The study plot consisted of 4-yr-old Hamlin orange tress, with a north-south row orientation. Fruit on the north quadrant of the tree were found to have the highest mean surface damage, followed by the east, south, and westquadrants. The frequency distribution of fruit surface damage changed with mean damage levels. When the mean damage was low, most of the fruit had no rust mite damage. With increasing mean fruit damage, the proportion of fruit without damage decreased, and the proportion of fruit with higher damage correspondingly increased. The resulting frequencydistribution changed from an exponential decy curve to a more or less symmetrical unimodal curve, with the peak shifting toward higher damage classes as mean fruit surface damage was increased. The frequency distribution was fitted to a 2-variable logistic distribution function of mean fruit surface damage and damage class, using maximum likelihood estimation method. Fruit without rust mite damage was considered a discrete point at zero, and its relative frequency was determined as the height of the cumulative logistic at zero. The model approximated theactual date well at low mean fruit surface damage, but gave a poor fitat high mean values.
Palavras-Chave: | Frequency distribution; Yield loss model.
Thesagro: | Phyllocoptruta Oleivora.
Categoria do assunto: | --
Registro original: | Embrapa Mandioca e Fruticultura (CNPMF)
Exemplares: | CNPMF - (3486-1) - ADC - AP - -- - 595.705 -  - 595.705 - DIS