Examinando por Materia "Life cycle"

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    Biology of Diaphorina citri (Hemiptera: Liviidae) under glass house conditions in Palmira, Colombia.
    (Universidad del Valle, 2016-06-30) García, Yesenia; Ramos, Yaneth Patricia; Sotelo, Paola Andrea; Kondo, Takumasa; Sociedad Colombiana de Entomología - Socolen; Universidad del Valle
    In this study, the morphological characteristics of each stage of development, duration, survival, ecological parameters, reproductive capacity, longevity of adults, and stage-specific mortality of Diaphorina citri (Hemiptera: Liviidae) were determined. It was conducted in a greenhouse (maximum temperature: 37.1 ± 5.1 °C, minimum temperature: 25.0 ± 2.0 °C; maximum relative humidity: 67.0 ± 6.2%, minimum relative humidity: 39.5 ± 10.9%; 12: 12 h Light: Dark, natural light conditions) in the municipality of Palmira, Valle del Cauca. Mean time from egg to adult was 15.41 ± 0.49 days. The median survival time for females was 48.25 days and 50 days for males. The survival rate to adult stage of D. citri was 6.86% with the highest mortality rate recorded for first-instar nymphs (81%). Females oviposited an average of 237 eggs during their reproductive cycle. A dichotomous key, an essential tool for conducting biological studies, is provided to separate the different growth stages of the Asian citrus psillid. Studies on the biology of D. citri will serve as a baseline for the mass rearing of its parasitoid, T. radiata.
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    PublicaciónAcceso abierto
    Fertility life tables of Raoiella indica (Trombidiformes: Tenuipalpidae) at different temperature and humidity levels.
    (Universidad del Valle, 2019-08-30) Martínez Mejía, David; Otero Colina, Gabriel; González Gómez, Rebeca; Pérez Panduro, Alejandro; Valle Mora, Javier; Sociedad Colombiana de Entomología - Socolen; Universidad del Valle
    A study of fertility life tables of Raoiella indica was carried out on coconut (Cocos nucifera) leaflets at controlled temperature and relative humidity (RH) in Texcoco, Mexico, with the objective of estimating the parameters of population increase of this mite. Cohorts of 12-hour-old Raoiella indica eggs were incubated at 22.5, 25, 27.5 or 30 °C and 40-50 % RH, as well as 27.5 °C with 30-40, 60-70 or 80-90 % RH. They were observed daily until the last mite died. Females that attained adulthood were provided with two males to promote mating and their oviposition was recorded daily. Each one-day-old male was put in contact with a female quiescent deutonymph daily to determine how many times a male could copulate after the deutonymph became an adult. With all temperatures and RH’s, mortality was evenly distributed throughout the observations. Developmental rate, reproduction, and, consequently, parameters of population increase were significantly associated with temperature. The highest rate of population increase took place at 27.5 °C and 40-40 RH. By itself, RH did not significantly affect those variables, although its extreme values showed slight negative effects. Approximately four females per male were observed. Males copulated with 4.56 females on average; this suggests that between 20 and 30 % of the males are enough to fertilize all females present.
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    PublicaciónAcceso abierto
    Related factors to the Paraleyrodes sp. pos. bondari (Hemiptera: Aleyrodidae) population in avocado.
    (Universidad del Valle, 2016-12-30) Cruz Castiblanco, Ginna Natalia; Varón Devia, Edgar Herney; Quiroga Rojas, Luisa Fernanda; Monje Andrade, Buenaventura; Sierra Baquero, Paola Vanessa; Sociedad Colombiana de Entomología - Socolen; Universidad del Valle
    The severity of the damage caused by the avocado whitefly (Paraleyrodes sp. pos. bondari) and the difficulty to control it, has forced researchers and growers to find alternatives for its management. We investigated the life cycle of the avocado whitefly and the relation of environmental factors with the population of this insect and the presence of its natural enemies in avocado. Biweekly monitoring of ten avocado trees per cultivar (cvs. Hass, Lorena and Choquette) of the percentage of leaf area occupied by whitefly colonies in each of two commercial farms at Fresno (Tolima, Colombia) was conducted during nine months. The climatic variables: rainfall, temperature and relative humidity on each farm were measured on a daily basis. Finally, a quantification and identification of the beneficial fauna associated with the crop was carried out during seven months. The avocado whitefly had a total life cycle of 27.7 ± 0.19 days. Lorena had the highest presence of Paraleyrodes. An inverse correlation between percentage of whitefly incidence in all varieties and relative humidity was observed at La Chiripa farm. Encarsia sp., Eretmocerus sp., and Amitus sp. Were identified as the main potential natural enemies of Paraleyrodes sp. pos. bondari.