Data/hora: 20/05/2024 12:46:53

Biblioteca(s): | Embrapa Mandioca e Fruticultura.
Data corrente: | 16/06/1993
Data da última atualização: | 16/06/1993
Autoria: | HUANG, L-L; WANG, D-W; ZHANG, Q; ZHU, W.
Afiliação: | Citrus Research Institute, Chinese Academy of Agricultural Sciences, Beibei, Chongqing, Sichuan, People's Republic of China.
Título: | A study in the biology and control of the arrowhead scale (Unaspis yanonensis Kuwana)
Ano de publicação: | 1983
Fonte/Imprenta: | Tokyo, Japan: International Society of Citriculture, 1983
Volume: | v.2
Páginas: | p.640-643
Idioma: | Inglês
Conteúdo: | The arrowhead scale (Unaspis yanonensis Kuwana) is one of the most serious pest insects, and is prevalent in the citrus-growing districts. Through laboratory experiment and field investigation, the following observations were made during 1977-1980 in the vicinity of Chongqing in China. The scale has three complete generations in a year, and the winter is passed in the second instar larvae of pupal stage of males and 2nd instar larvae and adults of females. The longevity of the female scale is 75.7-235.2 days and she may lay 38.4-165.1 eggs which require 55.7-59.8 minutes to hatch. The larval stages (first to second instar larvae) require 30.8-36.6 days and one complete generation is 64.3-230 days. The difference between the lengths of the stages of different generations chiefly depends upon the temperature. A field survey showed the scale to have seven natural enemies including parasites and predators, such as Telsimia emarginata Chapin, Chilocorus hupehanus Miyatake, Cybocephalus nipponicus Endrody-Younga, Aphytis chrysomphali Morect, Aphytis sp., Physcus sp., and one ectoparasite of the male. The result of insecticide tests showed that the spraying of and emulsion of 40% omethoate (1:1000) or 40% Optunal (1:500) was effective for control. However, there was a tendency for the effect to decrease as the instar stage of larvae of arrowhead scales increased. Since the peak of occurrence of the first generation of larvae of the arrowhead scales was in the early May, this is a very successful period for control.
Palavras-Chave: | Citros; Inimigos naturais.
Thesaurus Nal: | Aphytis lingnanensis.
Categoria do assunto: | --
Registro original: | Embrapa Mandioca e Fruticultura (CNPMF)
Exemplares: | CNPMF - (13139-1) - ADD - PL - -- - 634.3040601 - I61p - 1984000417 - DIS