Abstract
Seasonal incidence of citrus psylla, Diaphorina citri Kuwayama was studied in Assam Lemon (Citrus limon 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 (4th-5th SW), second during April-May (17th - 18th SW) and the third during September (37th-38th SW). Three peaks were recorded—one at 11th SW (6.11 psyllids/shoot), the second at 21st SW (7.50 psyllids/shoot) and the third peak at 43rd 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 TMax and r = 0.182 for TMin) while RH% (r = −0.200 for RHMor and r = −0.200 for RHEvn) and rainfall had a negative correlation (r = −0.013). During the 1st peak population (11th SW) the average temperature, RH% and rainfall were 30.82˚C (TMax) and 16.68˚C (TMin), 55.36% (RHMor) and 62.72% (RHEvn) and nought respectively; while the corresponding values were 33.43˚C (TMax) and 24.29˚C (TMin), 76.43% (RHMor) and 75% (RHEvn) and 7.85 mm respectively during the 2nd peak (21st SW). Likewise, at the 3rd peak (43rd SW), the respective values were 30.22˚C and 19.07˚C (TMax and TMin, respectively), 80% and 76.79% (RHMor and RHEvn, respectively) and zero mm respectively.
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Claims 13
Claim · model-written summary
Psyllids appeared with new flush, which occurred three times yearly.
- Taxon
- Assam Lemont0
- Interactor
- psyllidsPsylloideae0pest
- Outcome
- psyllids appeared with the arrival of new flushe0
Verbatim
e0“The psyllids appeared with the arrival of new flush which occurred three times a year”
t0“Assam Lemon”
Claim · model-written summary
The first new flush occurred from late January to early February.
Verbatim
e0“the first during January last to early February (4th-5th SW)”
t0“Assam Lemon”
Claim · model-written summary
The second new flush occurred in April to May.
Verbatim
e0“second during April-May (17th - 18th SW)”
t0“Assam Lemon”
Claim · model-written summary
The third new flush occurred in September.
Verbatim
e0“the third during September (37th-38th SW)”
t0“Assam Lemon”
Claim · model-written summary
The first psyllid peak was 6.11 psyllids per shoot at week 11.
Verbatim
e0“one at 11th SW (6.11 psyllids/shoot)”
t0“Assam Lemon”
Claim · model-written summary
The second and highest psyllid peak was 7.50 psyllids per shoot at week 21.
Verbatim
e0“the second at 21st SW (7.50 psyllids/shoot)”
t0“Assam Lemon”
Claim · model-written summary
The third psyllid peak was 5.06 psyllids per shoot at week 43.
Verbatim
e0“the third peak at 43rd SW (5.06 psyllids/shoot)”
t0“Assam Lemon”
Claim · model-written summary
Psylla were active all year except the cold winter period, when numbers were low or absent.
- Taxon
- Assam Lemont0
- Outcome
- psylla were activee0
- Qualifier
- cold winter period when their population was either low or absente0
PsyllaOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The psylla were active throughout the whole year except during the cold winter period when their population was either low or absent”
t0“Assam Lemon”
Claim · model-written summary
Maximum temperature was positively associated with psyllid population, r = 0.304.
Verbatim
e0“Temperature showed a positive association with psyllid population (r = 0.304 for TMax and r = 0.182 for TMin)”
t0“Assam Lemon”
Claim · model-written summary
Minimum temperature was positively associated with psyllid population, r = 0.182.
Verbatim
e0“Temperature showed a positive association with psyllid population (r = 0.304 for TMax and r = 0.182 for TMin)”
t0“Assam Lemon”
Claim · model-written summary
Morning relative humidity was negatively associated with psyllid population, r = −0.200.
Verbatim
e0“RH% (r = −0.200 for RHMor and r = −0.200 for RHEvn) and rainfall had a negative correlation (r = −0.013)”
t0“Assam Lemon”
Claim · model-written summary
Evening relative humidity was negatively associated with psyllid population, r = −0.200.
Verbatim
e0“RH% (r = −0.200 for RHMor and r = −0.200 for RHEvn) and rainfall had a negative correlation (r = −0.013)”
t0“Assam Lemon”
Claim · model-written summary
Rainfall was negatively correlated with psyllid population, r = −0.013.
Verbatim
e0“rainfall had a negative correlation (r = −0.013)”
t0“Assam Lemon”