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United States Department of Agriculture

Agricultural Research Service

Research Project: IPM TECHNOLOGIES FOR SUBTROPICAL INSECT PESTS

Location: Subtropical Insects and Horticulture Research

Title: Population ecology and phenology of Diaphorina citri (Hemiptera: Psyllidae) in two Florida citrus groves

Authors
item Hall, David
item Hentz, Matthew
item Adair, Robert - FLA RESEARCH CENTER

Submitted to: Environmental Entomology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: April 3, 2008
Publication Date: August 10, 2008
Citation: Hall, D.G., Hentz, M.G., Adair, R.C. 2008. Population ecology and phenology of Diaphorina citri (Hemiptera: Psyllidae) in two Florida citrus groves. Environmental Entomology. 37:914-924.

Interpretive Summary: Studies were conducted during 2005 and 2006 to assess population densities and phenology of the Asian citrus psyllid in citrus within east central Florida. Young grapefruit and mature orange trees were sampled weekly for eggs, nymphs and adults on flush shoots; for adults on mature leaves; and for adults captured on yellow sticky card traps. Since infestations of eggs and nymphs of this psyllid develop strictly on young flush, the abundance of flush was assessed weekly. Flush abundance was an inconsistent indicator of population densities of the psyllid. Mean density per shoot by itself was an inconsistent indicator of overall population levels of the psyllid because few shoots were sometimes present when mean densities per shoot were high. An index of abundance based on both flush abundance and mean density of psyllids per flush shoot provided a more realistic measure of population levels. May, June and July were periods of time when egg and nymphs of the psyllid were consistently present and most abundant, but the study indicated large infestations may occur at any time of the year depending on environmental factors and flush availability. Yellow sticky traps were effective for both male and female D. citri. The research indicated trap captures are useful for detecting adults and for gauging population trends of adults on mature leaves.

Technical Abstract: Studies were conducted during 2005 and 2006 to assess population densities and phenology of the psyllid Diaphorina citri Kuwayama in citrus within east central Florida. Young, irrigated grapefruit and mature, non-irrigated orange trees were sampled weekly for eggs, nymphs and adults on flush shoots; for adults on mature leaves; and for adults captured on yellow sticky card traps. Since infestations of immature D. citri develop strictly on young flush, the abundance of flush was assessed weekly. Overall means of 26.5, 16.8 or 0.27 eggs, nymphs or adults per flush shoot, respectively, were observed in the young trees. In the mature trees, overall means of 16.0, 12.7 or 0.31 eggs, nymphs or adults per flush shoot were observed, respectively. Flush abundance was an inconsistent indicator of the mean density of D. citri per flush shoot. Mean density per shoot by itself was an inconsistent indicator of overall population levels of D. citri because few shoots were sometimes present when mean densities per shoot were high. An index of abundance based on both flush abundance and mean density of D. citri per flush shoot provided a more realistic measure of population levels. May, June and July were periods of time when immature D. citri were consistently present and most abundant, but the study indicated large infestations may occur at any time of the year depending on environmental factors and flush availability. Yellow sticky traps were effective for both male and female D. citri. The research indicated trap captures are useful for detecting adults and for gauging population trends of adults on mature leaves.

Last Modified: 4/24/2014
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