%0 Journal Article
%T Seasonal Incidence of <i>Diaphorina</i><i> citri </i>Kuwayama in Assam Lemon and Its Relationship with Weather Factors in Sub-Himalayan Plains of West Bengal
%A Tanuj Debbarma
%A Tapan Kumar Hath
%A Deb Sankar Gupta
%A Swagata Bhowmik
%J American Journal of Plant Sciences
%P 1222-1237
%@ 2158-2750
%D 2024
%I Scientific Research Publishing
%R 10.4236/ajps.2024.1512077
%X Seasonal incidence of citrus psylla, <i>Diaphorina</i><i> citri </i>Kuwayama was studied in Assam Lemon (<i>Citrus limon</i> L. Burm) in two consecutive years in sub-Himalayan plains (terai zone) of West Bengal (India). The psyllids appeared with the arrival of new flush which occurred three times a year, the first during January last to early February (4<sup>th</sup>-5<sup>th</sup> SW), second during April-May (17<sup>th</sup> - 18<sup>th</sup> SW) and the third during September (37<sup>th</sup>-38<sup>th</sup> SW). Three peaks were recorded&#8212;one at 11<sup>th</sup> SW (6.11 psyllids/shoot), the second at 21<sup>st</sup> SW (7.50 psyllids/shoot) and the third peak at 43<sup>rd</sup> SW (5.06 psyllids/shoot). The second peak recorded the highest psyllid population. The psylla were active throughout the whole year except during the cold winter period when their population was either low or absent. Temperature showed a positive association with psyllid population (r = 0.304 for T<sub>Max</sub> and r = 0.182 for T<sub>Min</sub>) while RH% (r = &#8722;0.200 for RH<sub>Mor</sub> and r = &#8722;0.200 for RH<sub>Evn</sub>) and rainfall had a negative correlation (r = &#8722;0.013). During the 1st peak population (11<sup>th</sup> SW) the average temperature, RH% and rainfall were 30.82&#730;C (T<sub>Max</sub>) and 16.68&#730;C (T<sub>Min</sub>), 55.36% (RH<sub>Mor</sub>) and 62.72% (RH<sub>Evn</sub>) and nought respectively; while the corresponding values were 33.43&#730;C (T<sub>Max</sub>) and 24.29&#730;C (T<sub>Min</sub>), 76.43% (RH<sub>Mor</sub>) and 75% (RH<sub>Evn</sub>) and 7.85 mm respectively during the 2nd peak (21<sup>st</sup> SW). Likewise, at the 3<sup>rd</sup> peak (43<sup>rd</sup> SW), the respective values were 30.22&#730;C and 19.07&#730;C (T<sub>Max</sub> and T<sub>Min</sub>, respectively), 80% and 76.79% (RH<sub>Mor</sub> and RH<sub>Evn</sub>, respectively) and zero mm respectively.
%K Seasonal Incidence
%K Citrus Psyllid
%K Assam Lemon
%K <i>Citrus limon</i>
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=138547