Pesquisa Agropecuária Brasileira (2010) 45, 791-796

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Ademir Diniz Neves, Marinéia de Lara Haddad, Neide Graciano Zério and José Roberto Postali Parra (2010)
Exigências térmicas e estimativas do número de gerações de ortézia dos citros criadas em limão-cravo
[Temperature requirements and generation number estimates of croton mealybug reared in Rangpur lime]
Pesquisa Agropecuária Brasileira 45 (8), 791-796
Abstract: The objective of this work was to determine the temperature requirements for the development of croton mealybug (Praelongorthezia praelonga) and to estimate the number of year generations at the state of São Paulo, Brazil, counties of Bauru, Barretos, São José do Rio Preto, Bebedouro, Avaré, Araraquara, Itapetininga and Limeira. In order to determine stage durations of egg and nymph stages, and their temperature requirements, the insects were reared on Rangpur lime (Citrus limonia) seedlings at 18, 20, 22, 25, 28, 30 e 32ºC, under 70±10% relative humidity and a 14-hour photofase. Developmental stages and biological cycle (egg-adult) durations were affected by temperature, and higher values of these parameters were obtained at lower temperatures. The lowest temperature development threshold (TT) and thermal constant (K) for egg and nymph stages and for the egg-adult period were 6.16ºC and 398.40 degree-days (DD), 12.10ºC and 374.50 DD, and 10.28ºC and 735.29 DD, respectively. Based on the air temperature average values from the evaluated counties, the number of generations per year varies from 4.99 to 6.60.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
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Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Praelongorthezia praelonga Citrus (genus) Brazil (south)