Distribution and harmfulness of beetle stem weevil in Ukraine

Purpose. To identify the present habitat and areas of high infestation of beet stem weevil in Ukraine. Меthods. Field study, analytical evaluation. Results. It was revealed that beet stem weevil as species occured in cenosis of Odesa, Kherson, Mykolaiv, Zaporizhzhia, Donetsk, Kharkiv, Poltava, Kirovohrad, Lviv, Khmelnytskyi Oblasts and the Autonomous Republic of Crimea. Significant development and high harmfulness of phytophage in sugar beet crops during 2011–2015 was registered in Kharkiv, Poltava and Sumy Oblasts. It is also likely that high infestation of beet stem weevils can be found in the northern districts of Dnipropetrovsk, Donetsk Oblasts and western districts of Luhansk Oblast, where, in the absence of sugar beet crops, they locally developed on weedy plants of the goosefoot and amaranth families. Conclusions. In recent years, global warming and general deterioration of agricultural sector created a favorable environment in southeast Ukraine for mass reproduction of beet stem weevil which, occupying free ecological niches, is transforming into a dangerous pest for sugar beet crops.

Formation of stability sugar beet plants harmful organisms in seed treatment protective-stimulating substances

Efficiency of new protective-stimulating formulations against pests of sugar beet sprouts has been investigated. It was established that the application of plant growth regulators in combination with protectants for seed pre-treatment can increase the efficiency of such formulations against pests and pathogens, in particular, improves field seed germination, initial plant growth and development, reduces the level of damage by beet flea beetles, beet weevils and black root.