Influence of a complex of environmental factors on oviposition of overwintering females of Colorado potato beetle in the conditions of the Priobie forest-steppe

The article presents the results of long-term research on the influence of environmental factors (air temperature and humidity, precipitation, sum of effective temperatures (SET) and daylight duration) on the beginning, duration and end of oviposition of overwintered imago Leptinotarsa decemlineata Say in potato plantings in the central forest-steppe Priobsky agro-landscape area. During the years of overwintering females of Colorado potato beetle in the conditions of the Priobie forest-steppe of study, the egg-laying process began on June 19 ± 12 days at an average daily air temperature of 18.3 ± 10.7 °C, SET of 165.6 ± 78.2 °C, air humidity of 66.8 ± 24.3%, precipitation of 0.4 ± 0.4 mm, and daylight hours of 17:19 ± 0:09 h. The complex impact of all abiotic factors was found. The factors considered had 74.9% influence on the number of eggs laid on the first day of oviposition (rainfall showed the greatest influence). The duration of the oviposition period depended on environmental factors by 54.1% (air temperature had the maximum influence). The share of influence of the whole complex of factors amounted to 75.7% (SET had the greatest influence). The average duration of the oviposition process was 18.8 ± 10 days with an average daily air temperature of 19.1 ± 5.8 °C, SET of 132.3 ± 77.6 °C, air humidity of 66.7 ± 25.2%, precipitation of 39.6 ± 39.6 mm, and daylight hours of 17:15 ± 0:12 h. During this time, overwintering females laid an average of 0.30 ± 0.27 ovipositors per plant. The studied factors determined the number of eggs laid on the date of the end of the oviposition period by 83.3% (precipitation influenced the most). On average, the end of the oviposition process occurred on July 10 ± 10 days with an average daily air temperature of 19.0 ± 3.4 °C, SET of 306.4 ± 113.9 °C, air humidity of 71.4 ± 19.3%, precipitation of 5.7 ± 5.7 mm, and daylight hours of 17:04 ± 0:25 h. The number of ovipositors at the end of the egg-laying period was 0.1 ± 0.09 eq/plant. 

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