Seasonal Abundance of Diaphorina citri and Tamarixia radiata in Citrus Groves and Murraya paniculata of Corrientes, Argentina
The Asian citrus psyllid, Diaphorina citri Kuwayama, vector of Huanglongbing (HLB) or greening disease (now in Brazil) , is present in Corrientes (Argentina) where also its host Murraya paniculata (L.)is a common ornamental plant. Tamarixia radiata (Waterston) was found parasitizing D. citri nymphs on citrus and M. paniculata in 2005. A survey with yellow sticky cards was carried out during 2003 - 2007 in irrigated and non-irrigated grove of Valencia orange at Bella Vista to assess the adult psyllid dynamics during the year; traps of 12cm x7cm (20 per grove of 392 plants) were hung at 1. 5m from the ground on the north side of the tree and replaced every 30 days; D. citri was counted at the laboratory under stereoscopic microscope. Fifty shoots of citrus (pruned orange, lemon and grapefruit) and M. paniculata were collected weekly during 2006 - 2008)to study parasitism; fourth and fifth instar nymphs were separated and reared until psyllid or parasitoid adult emergency. The number of D. citri adults per month per trap was low (highest; 2. 62, May 2005 ). More psyllids were trapped at the non-irrigated grove; adults per trap values were lower than one at the irrigated grove. The insect was present during spring with peaks in August-September (2004) and during summer-fall with peak in February (2005) and May (2005); April rainfall (258 mm, 2005) caused the population level decrease; none or very few psyllids were trapped in June and July. In the study of nymphs from citrus shoots collected during summer 2006 2007, Tamarixia radiata was the only parasitoid collected from December to February and the highest parasitism observed was 44.92％. In summer 2007 -2008 more nymphs were obtained from M. paniculata than from citrus shoots and the highest emerged adults were: D. citri (66. 5％ January; 60. 6％ February) , T. radiata (26.9％ January, 34.1％ February), and Signiphora sp. (6.6％ January and 5.3％ February). Species in the genus Signiphora are cited as hiperparasitoids of T. radiata. Although D. citri levels were low and no control measures have been necessary up to date, population and natural enemy evaluations will continue considering its importance as HLB vector. Regulation to avoid new plantings of M. paniculata, a host for the psyllid and the greening pathogen, need to be discussed.
HLB Psyllid Greening Yellow traps
Caceres S. A. Aguirre V. Mino L. Almiron
EEA INTA Bella Vista , CC N° 5 (3432) Bella Vista, Corrientes
国际会议
11th International Citrus Congress(第11届国际柑橘大会)
武汉
英文
1213-1217
2008-10-01（万方平台首次上网日期，不代表论文的发表时间）