(Research paper ) Population densities of blossom thrips at different stages of apple in Kashmir

(Research paper )

 

Population densities of blossom thrips at different stages of apple in Kashmir

Abid Showkat, Sheikh Bilal Ahmad, IA Khan, Sajad Ahmad Mir,
Parveena Banoo, Zakir S Khan and IA Khan


Abstract

Thrips continue to be one of the most important pests affecting agricultural production systems. Thrips of Kashmir region on apple crop have been poorly studied in despite their significance to the important crop of valley, so in this regard a research trail were carried out for the year 2016 and 2017 to determine the change in the population densities from bud burst to peanut stage of apple by sampling each of the five stages: bud burst, pink bud, full bloom, petal fall and peanut stage. Two methods viz; sticky traps and direct count were employed to determine the change in the densities of the pest. Thrips density was
significantly affected by apple bloom stages in both years. Densities were higher during bloom period both in 2016 and 2017. However total thrips count was more on sticky traps than direct count. Of total (264) count by sticky traps, 35.98% represents the bloom period followed by petal fall which represents 29.92% and 19.31% for pink bud and 13.25% for bud burst for the year 2016. In case of direct count of total number (220) was counted out of which full bloom represents 36.81% followed by petal fall which
represents 31.36% and pink bud which represents 20% and 11.81% bud burst for the year 2016. A similar trend was followed for the year 2017 but varying total Thrip count in both cases.

 


Material method

Studies were conducted in an orchard with proper infestation of pest. The changes in the abundance of thrips were monitored from bud burst to petal fall of apple by sampling each of the five stages: bud burst, pink, full bloom, petal fall and peanut stage. Five trees are going to select: 4 in corner and one in the middle of the orchard. These selected trees will not go to receive any insecticide application during studies and these are again used for the next year. From each selected tree two methods viz: sticky traps and direct count were employed for determining the densities of pest at above various described stages. Blue wet sticky traps were used to monitor thrips in apple orchards. Traps of 10.2 cm wide and 12.5 cm high and pre–coated on both sides with sticky adhesive. Every 7 days, traps were removed and replaced. Blossom of plant were shaken or flicked vigorously into a
white cup (either Styrofoam or plastic), even without removing the blossom from the plant. Five flower clusters from four directions and one at center per tree were sampled.

 


Results and discussion

Thrips density was significantly affected by apple bloom stages in both years. Densities were higher during bloom period both in 2016 and 2017. However total thrips count was more on sticky traps than direct count. Of total (264) count by sticky traps, 35.98% represents the bloom period followed by petal fall which represents 29.92% and 19.31% for pink bud and 13.25% for bud burst for the year 2016 (Table 1, fig. 1). In case of direct count of total number (220) was counted out of which full bloom represents 36.81% followed by petal fall which represents 31.36% and pink bud which represents 20% and 11.81% bud burst for the year 2016. A similar trend was followed for the year 2017 (Table 2, fig. 2) but varying total thrip count in both cases. Of total (280) count by sticky traps, 36.42% represents the bloom period followed by petal fall which represents 29.64% and 20% for pink bud and 13.92% for bud burst for the year 2017. In case of direct count of total number (242) was counted out of which full bloom represents 35.95% followed by petal fall which represents 31% and pink bud which represents 20.24% and 12.80% bud burst for the year 2017. Thrip population was found least in peanut stage while it reached maximum in full bloom for both years 2016
and 2017.


Conclusions

Thrips population densities are significantly affected by apple bloom stage. The thrip population increases from green tip stage up to bloom stage and then it decreases with faster rate. Counts on sticky traps are more than on direct counts.

 




ORIGINAL DOCUMENT

 


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