scholarly journals Population Dynamics and Aspects of the Biology of Citrus Psylla, Diaphorina citri Kuw., in Maharashtra

1993 ◽  
Vol 12 (12) ◽  
Author(s):  
V. M. Chavan ◽  
A. S. Summanwar ◽  
P. Moreno ◽  
J. V. Graça ◽  
L. W. Timmer
Keyword(s):  
Population Dynamics ◽  
Diaphorina Citri ◽  
Citrus Psylla

scholarly journals Impact of abiotic factors on build-up of citrus psylla, Diaphorina citri Kuwayama population in Punjab, India

2014 ◽  
Vol 6 (2) ◽  
pp. 371-376 ◽  
Author(s):  
Hijam S. Devi ◽  
D. R. Sharma
Keyword(s):  
Relative Humidity ◽  
Disease Transmission ◽  
Minimum Temperature ◽  
Abiotic Factors ◽  
Winter Season ◽  
Seasonal Abundance ◽  
Maximum Temperature ◽  
Weak Links ◽  
Diaphorina Citri ◽  
Citrus Psylla

Seasonal abundance of citrus psylla (Diaphorina citri) Kuwayama was studied on Kinnow mandarin under Punjab conditions during 2012 and 2013. Population of D. citri was present throughout the year but only adults found surviving during December and February. There was no nymphal population when maximum temperature was > 39°C or < 7°C. Two population peaks of nymphs wer e observed, first in April-May and second in August- September. Thereafter, there was abrupt decline in nymphal population during June and July during both the years when the weather conditions i.e. maximum, minimum temperature (°C), relative humidity (%), rainfall (m m) and sunshine (hrs) ranged from 24.4-44, 22.4-31.8, 25.5-100, 0-108.0 and 0-13.5, respectively. Highest peaks of adult were found during May followed by June. With the decrease in temperature from the end of September, the population of D. citri started to decrease and reached its lowest during winter season. Correlation analysis for both the years indicated that maximum and minimum temperature, sunshine and rainfall were positively correlated with nymphal, adult and mixed population but the effect of rainfall on adult population was non-significant, while relative humidity was negatively correlated. The study is useful to find out the weak links of psyllid populations in relation to abiotic factors and that could be exploited to curb its infestation and disease transmission.

scholarly journals SEASONAL FLUCTUATION OF ASIAN CITRUS PSYLLA POPULATIONS IN THE CITRUS ORCHARDS INFECTED WITH HUANGLONGBING IN SARGODHA, PAKISTAN

2017 ◽  
Vol 29 (1) ◽  
pp. 175
Author(s):  
Yasir Iftikhar ◽  
Imran U. Haq ◽  
Waqas Raza ◽  
Muhammad I. Ullah ◽  
Sajjad Ali ◽  
...  
Keyword(s):  
High Temperature ◽  
Environmental Factors ◽  
Minimum Temperature ◽  
Management Strategy ◽  
Integrated Management ◽  
Seasonal Fluctuation ◽  
Diaphorina Citri ◽  
Citrus Production ◽  
Citrus Orchards ◽  
Citrus Psylla

A study on seasonal fluctuation in Citrus psylla (Diaphorina citri) (CP) population in citrus orchards infected with Huanglongbing was carried out in relation to environmental factors in six tehsils of Sargodha district. The population of citrus psylla was reached to the peak twice in a year. Young flushes favored the build-up in psylla population. Minimum temperature and rainfall had highly significant correlation with build-up in population of citrus psylla in all the six tehsils of Sargodha. Although, high temperature also favored the high population of citrus psylla in two tehsils. August and mid-March to April were the two times when population of citrus psylla reached to the peak. Therefore, an integrated management strategy can be formulated with this study that will not only help in reducing the HLB incidence but also increase in citrus production.

Evaluation of petroleum spray oils for control of the Asian citrus psylla, Diaphorina citri (Kuwayama) (Hemiptera: Psyllidae), in China

1997 ◽  
Vol 43 (1) ◽  
pp. 71-75 ◽  
Author(s):  
D. J. Rae ◽  
W. G. Liang ◽  
D. M. Watson ◽  
G. A. C. Beattie ◽  
M. D. Huang
Keyword(s):  
Diaphorina Citri ◽  
Citrus Psylla

Population Dynamics and Growth Rates of Endosymbionts During Diaphorina citri (Hemiptera, Liviidae) Ontogeny

2014 ◽  
Vol 68 (4) ◽  
pp. 881-889 ◽  
Author(s):  
Fabio Cleisto Alda Dossi ◽  
Edney Pereira da Silva ◽  
Fernando Luis Cônsoli
Keyword(s):  
Population Dynamics ◽  
Growth Rates ◽  
Diaphorina Citri

scholarly journals Insetos Sugadores (Sternorrhyncha) em Cultivo Orgânico de Tangerina cv. Poncã (Citrus reticulata Blanco): Diversidade, Constância, Freqüência e Flutuação Populacional

2009 ◽  
Vol 2 (2) ◽  
pp. 42-48 ◽  
Author(s):  
William Costa Rodrigues ◽  
Paulo Cesar Rodrigues Cassino ◽  
Mateus Varajão Spolidoro ◽  
Reinildes Silva-Filho
Keyword(s):  
Population Dynamics ◽  
Citrus Reticulata ◽  
Diaphorina Citri ◽  
Citrus Reticulata Blanco ◽  
Population Decrease ◽  
Coccus Viridis ◽  
Population Average ◽  
Toxoptera Citricida ◽  
Toxoptera Aurantii ◽  
Pinnaspis Aspidistrae

O objetivo do trabalho foi estudar a diversidade, constância, freqüência e a flutuação populacional de insetos sugadores da subordem Sternorrhyncha associados à tangerina cv. Poncã sob o sistema de cultivo orgânico. Os levantamentos foram realizados entre outubro de 2002 e outubro de 2003. Dentre os aleirodídeos, Aleurothrixus floccosus Maskell destacou-se dos demais, com média populacional igual a 74,06%. Aleurotrachelus cruzi Cassino obteve média de 52,6%. Entre as cochonilhas destacaram-se Selenaspidus articulatus (Morgan) (23,96%) e Pinnaspis aspidistrae (Signoret) (19,38%). O psilídeo Diaphorina citri Kuwayama obteve média de 52,6%, sendo a segunda espécie com maior média. Os pulgões Toxoptera citricida (Kirkaldy) e Toxoptera aurantii (Boyer), somente ocorreram em período de brotação e floração, com média populacional de 7,6% e 6,25%, respectivamente. Quanto à diversidade das espécies o período com maior diversidade, ocorreu na 1ª quinzena de setembro de 2003 (H’= 0,964), coincidindo com a menor dominância (D= 0,200), e menor diversidade na 1º quinzena de maio de 2003 (H’= 0,657) e maior dominância (D= 0,522). As espécies constantes foram: A. floccosus (100%), A. cruzi (96%), Coccus viridis (Green) (100%), P. aspidistrae (100%) e D. citri (100%). As espécies mais freqüentes foram: A. floccosus (30,79%) e D. citri (21,87%). Os resultados sugerem que as espécies verificadas possuem a dinâmica populacional em parte influenciada pela competição interespecífica, pois quando há um aumento populacional dos aleirodídeos, há um decréscimo da população das cochonilhas e vice-versa, além dos fatores ambientais, a predação e o parasitismo. Sucker Insects (Sternorrhyncha) in Organic Cropping of Tangerine cv. Ponkan (Citrus reticulata Blanco): Diversity, Constancy, Frequency and Populational Fluctuation Abstract. The aim of this work was to study the diversity, constancy, frequency and the population fluctuation of the sucker insects of the suborder Sternorrhyncha associated with the tangerine cv. Ponkan cultivated under the organic. The study was conducted from October 2002 to October 2003. Among the whiteflies, Aleurothrixus floccosus Maskell had a population average equivalent to 74.06%. Aleurotrachelus cruzi Cassino reached 52.6%. Among the scale, Selenapidus articulatus Morgan reached 23.96% and Pinnaspis aspidistrae (Signoret) 19.38%. The Diaphorina citri Kuwayama average was 52.6%, the second bigger average. The aphids Toxoptera citricida (Kirkaldy) and Toxoptera aurantii (Boyer) took place only during the budding and blooming, presenting a population average of 7.6% and 6.25%, respectively. The period in which occurred the largest diversity was the first fifteen days of September 2003 (H’= 0.964), simultaneously to the least dominance (D = 0.200), and in the first fifteen days of May 2003 occurred the least diversity (H’= 0.657) and the largest dominance (D = 0.522). The constant species that were more prominent were: A. floccosus (100%), A. cruzi (96%), Coccus viridis (Green) (100%), P. aspidistrae (100%) and D. citri (100%). The most frequent species were A. floccosus (30.79%) and D. citri (21.87%). To sum up, the results show that all the species studied have a population dynamics in part influenced by the interspecific competition, as there is a population increasing of whiteflies, there is a population decrease of scale and vice-versa, as well as the environmental and predatory factors and the parasitism.

scholarly journals Efficacy of Insecticides Against Citrus Psylla (Diaphorina Citri Kuwayama) in Field and Laboratory Conditions

2015 ◽  
Vol 48 (2) ◽  
pp. 91-97 ◽  
Author(s):  
M. Qasim ◽  
D. Hussian
Keyword(s):  
Block Design ◽  
Diaphorina Citri ◽  
Citrus Orchard ◽  
Laboratory Conditions ◽  
Controlled Conditions ◽  
Population Reduction ◽  
Randomized Complete Block Design ◽  
Field And Laboratory Conditions ◽  
Citrus Psylla

Abstract The experiments were conducted in a citrus orchard to check the efficacy of insecticides against citrus psylla, and mortality was observed after three days, seven days and then after one month. Four insecticides, Polytrin-C, Talstar, Bifenthrin and Imidacloprid applied, had an almost equal effect on the population reduction of citrus psylla on all citrus plants. The trial was laid out in randomized complete block design (RCBD) having five treatments with three replications in a citrus orchard, after three days of spray showed percentage control as 96.91%, 94.33%, 93.83% and 93.06% of following insecticides Polytrin- C, Imidacloprid, Bifenthrin and Actara, respectively, calculated by Minitab 15. Psylla adults were exposed to different concentrations (500, 400, 300, 200 and 100 ppm) of Imidacloprid and Bifenthrin, and two controlled conditions (with leaves and without leaves). Both Imidacloprid and Bifenthrin insecticides proved to be the most effective against D. citri with lethal times (LT50s) of 4 and 5 hours, respectively, at a concentration of 500 ppm, calculated from probability test with Minitab-15

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