Journal of Applied and Natural Science 6 (2): 371-376 (2014)
Impact of abiotic factors on build-up of citrus psylla, Diaphorina citri
Kuwayama population in Punjab, India.
Hijam S. Devi1* and D. R. Sharma2
1Department of Entomology, Punjab Agricultural University, Ludhiana-141004, INDIA
2 Department of Fruit Science, Punjab Agricultural University, Ludhiana-141004, INDIA
*Corresponding author. E-mail: email@example.com
Abstract : 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.
Keywords :Citrus psylla, Diaphorina citri, Hemiptera, Mandarin, Psyllidae, Punjab, Seasonal abundance.