Strategy of HLB management with insecticides in citrus groves in São Paulo, Brazil

مرکز و کتابخانه مطالعات اسلامی به زبان های اروپایی

منو

" Strategy of HLB management with insecticides in citrus groves in São Paulo, Brazil "
Baldassari, R. B.; Lozano, F.; Rinaldo, D.; Gobato, C. A.G.; Costa, D. F.

Document Type	:	AL
Record Number	:	942334
Doc. No	:	LA44c57799
Language of Document	:	English
Main Entry	:	Baldassari, R. B.; Lozano, F.; Rinaldo, D.; Gobato, C. A.G.; Costa, D. F.
Title & Author	:	Strategy of HLB management with insecticides in citrus groves in São Paulo, Brazil [Article]\ Baldassari, R. B.; Lozano, F.; Rinaldo, D.; Gobato, C. A.G.; Costa, D. F.
Title of Periodical	:	Journal of Citrus Pathology
Volume/ Issue Number	:	1
Date	:	2014
Abstract	:	Huanglongbing(HLB) , disease caused by bacteria Candidatus Liberibater asiaticus and Ca. L. americanus, has as vector Diaphorina citri. Since 2004 has caused huge losses on citrus industry of São Paulo state, Brazil. This research evaluated, during three consecutive years, an insecticide spraying program (Bayer® program – T1) consisted of two imidacloprid drench applications during the rainy season and one trunk application (Winner®) in the autumn, preceded and followed by foliar sprays of insecticides (Decis® or Provado®) based on an psyllid action threshold, compared to standard program of the grower, that used several foliar sprayings (Standard program – T2). This trial was carried out in 34 commercial groves in different counties of São Paulo state with trees at different age, variety/rootstock combination and canopy size. In each grove there was one plot per treatment consisted by 1000 trees. The incidence of D. citri and the number of HLB-symptomatic plants was fortnightly evaluated. The data were subjected to analysis by the test F and the averages comparated by Tukey (0,05). In average, after three years, it was observed in T1 a lower incidence of D. citri and consistent reduction of the number of HLB symptomatic plants (25,4) with 9 less insecticide applications. Even having been a consistent reduction of the vector population, added to the known effect of systemic acquired resistance (SAR) due to use of Imidacloprid in plants of citrus infected with Xanthomonas citri subsp. citri, this research shows an analogous process could be occurring on the pathosystem Citrus x Candidatus L. asiaticus e C. L. americanos, with positive contribution to growers and should be more detailed on further researches.