Population dynamics of wheat and predatory thrips in winter wheat agrocenosis in the forest-steppe of the Samara region

   The current paper has presented the three-year study results (2021–2023) on recording the population dynamics of wheat and predatory thrips during the spring-summer vegetation period of winter common wheat in the forest-steppe of the Samara region.

   The purpose of the study was to determine the dynamics of the seasonal development of wheat and predatory thrips according to the phenophases of the development of winter common wheat in the forest-steppe of the Samara region.

   For this purpose, there were carried out the calculations using the mowing method with an entomological net on winter wheat crops in different phenophases of development, and the population of species and thrips were determined in the laboratory under a binocular. According to weather conditions, 2021 and 2023 were characterized as dry and hot, 2022 was characterized as cool with plenty of precipitation in the first half of the winter wheat vegetation period. The population dynamics of wheat and predatory thrips varied depending on the weather conditions of the spring-summer period of the year. In the hot years of 2021 and 2023 there were 2 periods of increase in population. In 2021, the period of maximum population of wheat thrips was observed from a heading stage to a flowering stage (1016 and 1048 specimen per 100 sweeps of the net) and in the phase of milky-wax ripeness (426 specimen per 100 sweeps of the net). In 2022, the population of wheat thrips on plants increased gradually, the peak was noted once during the flowering stage, amounting to 1084 specimen per 100 sweeps of the net. In 2023, a population increase was observed in the heading stage (1782 specimen per 100 sweeps of the net) and the phase of milky-wax ripeness (421 specimen per 100 sweeps of the net). In the hot years of 2021 and 2023 there were 2 periods of increase in predatory thrips’ population; the maximum number of entomophages was observed during the heading stage and amounted to 87 and 61 specimens per 100 sweeps of the net, respectively. In the cool year of 2022, there was one population increase during the flowering stage and amounted to 14 specimens per 100 sweeps of the net. In the phases of heading and flowering of plants, there were predominantly adult insects (imago), and in the phases of milky and milky-wax ripeness, there were predominantly found larvae of different ages. The weather conditions in 2021 and 2023 turned out to be more favorable for the development of wheat and predatory thrips than in 2022.

1. Emel'yanov N. A., Kritskaya E. E., Es'kov I. D., Lobachev Yu. V. Vredonosnost' pshenichnogo tripsa (Naplothrips tritici kurd.) na ozimoi i yarovoi pshenitse pri povrezhdenii generativnykh organov rastenii [Harmfulness of wheat thrips (Haplothrips tritici kurd.) on winter and spring wheat when the generative organs of plants are damaged] // Agrarnyi nauchnyi zhurnal. 2018. № 5. S. 19–25. DOI: 10.28983/asj.v0i5.469

2. Kurrum R., Gritsenko V. V. Vidovoi sostav tripsov (Insecta: Thysanoptera) na selektsionnykh posevakh yarovoi pshenitsy v RGAU-MSKHA imeni K. A. Timiryazeva [Varietal composition of thrips (Insecta: Thysanoptera) on breeding crops of spring wheat in the RGAU-MAA named after K. A. Timiryazev] // Izvestiya Timiryazevskoi sel'skokhozyaistvennoi akademii. 2023. № 1. S. 57–65. DOI: 10.26897/0021-342X-2023-1-57-65

3. Sharapov I. I., Sharapova Yu. A., Abdryaev M. R. Vliyanie meteouslovii na urozhainost' i soderzhanie belka v zerne ozimoi pshenitsy [The effect of weather conditions on productivity and protein content in winter wheat grain] // Sibirskii vestnik sel'skokhozyaistvennoi nauki. 2023. T. 53, № 9. S . 40–48. DOI: 10.26898/0370-8799-2023-9-5

4. Abdillayev M., Bababekov Q. Wheat thrips (Haplothrips tritici Kurd.) damage on grain crops in Uzbekistan// E3S Web of Conferences: International Conference on Sustainable Management of Earth Resources and Biodiversity (SERBEMA-2023). 2023. Vol. 421. Р. 1–6. DOI: 10.1051/e3sconf/202342104001

5. Arif M., Waheed M. Q., Lohwasser U., Shokat S., Algudah A. M.,Volkmar C., Börner A. Genetic insight into the insect resistance in bread wheat exploiting the untapped natural diversity // Frontiers in Genetics. 2022. Vol. 13. P. 1–19. DOI: 10.3389/fgene.2022.828905

6. Bauetdinov B. O., Sultanbaeva F. A.-K. Developmental Bioecology And Control Measures Of Sucking Pests In Wheat Biotope Of Karakalpakstan Agrobiocenosis // The American Journal of Horticulture and Floriculture Research. 2021. Vol. 3, № 2. P. 7–11. DOI: 10.37547/tajhfr/Volume03Issue02-02

7. Glazunova N. N., Bezgina Yu. A., Maznitsyna L. V., Drepa E. V., Ustimov D. V. Protection the winter wheat from pests in the south of Russia // Research Journal of Pharmaceutical, Biological and Chemical Sciences. 2018. Vol. 9, № 4. Р. 578–582.

8. Malschi D., Tărău A. D., Valean A.-M., Sopterean L., Suciu A. L., Dărab J. D., Chetan C., Tritean N. Wheat pest dynamics, forecasting and current importance of the attack, to develop integrated control system in the center of Transylvania // Romanian Agricultural Research. 2018. Vol. 35, P. 203–220. DOI: 10.59665/rar3525

9. Malschi D., Valean A-M., Dărab J. D., Tărău A. D., Sopterean L., Chetan F., Chetan C., Muresanu F. New data on wheat pests and their integrated control in the conservative no tillage soil system in Transylvania // ProEnvironment. 2019. Vol. 12, № 38. Р. 221–230.

10. Ualiyeva R. M., Kaverina M. M., Ivanko L. N., Zhangazin S. B. Assessment of Spring Wheat Varieties for Pest Resistance // Online Journal of Biological Sciences. 2023. Vol. 23 (4). P. 489–503. DOI: 10.3844/ojbsci.2023.489.503

11. Zichcina L. N., Nosov V. V., Zichcin K. A. Seasonal Population Dynamics and Harmfulness of Wheat Thrips in Agrocenoses of Grain Crops // Agriculture. 2023. Vol. 13(1), Р. 1–13. DOI: 10.3390/agriculture13010148