Testing of domestic white cabbage hybrids at different planting densities

Четыре перспективных гибрида капусты белокочанной среднепозднего срока созревания селекции агрофирмы «Поиск» – F1Универс, F1 Застольный, F1 Поиск 2018 – и позднеспелый гибрид для хранения F1 Континент проходили испытание при разной густоте посадки: 19, 23, 27, 30, 33 тыс. растений/га в условиях Раменского района Московской области. Цель исследования: определить отзывчивость гибридов капусты белокочанной на густоту высадки для их выращивания в Нечерноземной зоне. Место исследований относится к лесной зоне в центральной части Русской равнины. Почвы – аллювиально-луговые среднесуглинистого механического состава. Погодные условия в годы проведения исследований были не совсем благоприятными для выращивания капусты белокочанной: в 2020 году отмечались осадки выше среднемноголетних значений, в 2021 году – жаркая засушливая погода, недостаток влаги, благоприятные условия для развития капустной моли и табачного трипса во время вегетации. Максимальной и стабильной урожайностью за два года исследований отличался среднепоздний гибрид F1 Застольный 144,54 т/га. Для получения наибольших сборов урожая продукции капусты белокочанной рекомендована высадка F1 Застольный при густоте 33 тыс. раст/га, для получения крупных кочанов на разреженных посадках 27 тыс. раст/га. F1 Поиск 2018 – при густоте 33 тыс. раст/га средняя урожайность составила 130,35 т/га, на разреженных посадках 141,4 т/га при густоте 23 тыс. раст/га. Гибрид F1 Универс реализовал свой биологический потенциал продуктивности 125,07 и 126,90 при 33 и 27 тыс. раст/га соответственно. Гибрид F1 Континент менее всех реагировал на изменение густоты посадки, имел наибольшую урожайность при 30 тыс. раст/га 120 т/га. Four promising F1 hybrids of white cabbage bred at Poisk company were tested at different planting density: 19, 23, 27, 30, 33 thousand plants/ha. in the Ramensky district of the Moscow region. F1 Univers, F1Zastolniy, F1 Poisk 2018 – mid-late ripening and F1Continent – late hybrid for storage. Objective of the study: to determine the responsiveness of white cabbage hybrids at different planting densities for their growing in the Non-Black Earth Zone. The research site belongs to the forest zone in the central part of the Russian Plain. Soils are alluvial meadows of medium loamy texture. The weather conditions during the years of the research were not entirely favorable for the cultivation of white cabbage. Precipitation above average annual values was observed in 2020. Hot dry weather, lack of moisture, favorable conditions for the development of cabbage moth and tobacco thrips during the growing season were in 2021. The mid-late hybrid F1 Zastolniy was distinguished by the maximum and stable yield over 2 years of research. Its yield was 144.54 t/ha. Planting F1Zastolniy was recommended at a density of 33 thousand plants/ha to maximize the yield of white cabbage production; large heads of cabbage should be obtained on sparse plantings at 27 thousand plants/ha. The average yield of F1Poisk 2018 was 130.35 t/ha with a density of 33 thousand plants/ha, 141.4 t/ha on sparse plantings with a density of 23 thousand plants/ha. The F1 Univers hybrid has realized its biological productivity potential of 125.07 and 126.90 at 33 and 27 thousand plants/ha, respectively. Hybrid F1 Continent reacted least of all to changes in planting density, had the highest yield at 30 thousand plants/ha 120 t/ha.

SPREAD AND HARMFULNESS OF THE THRIPS TABACI LIND IN APPLE PLANTATIONS OF THE KRASNODAR TERRITORY

The results of daily phytosanitary monitoring of fruit plantations and literature data on biology, ecology, harmfulness of tobacco thrips (Thrips tabaci Lind.) are presented. In the apple agrocenoses of the Kuban and Black Sea zones of Krasnodar Territory, an increase in the harmfulness of representatives of the order Thysanoptera is observed. An increase in the number of tobacco thrips was noted, which led to a decrease in the quality of fruits. In the growing season of 2018, isolated symptoms of fruit damage by phytophagous were noted, in the growing season of 2019, fruit damage reached up to 2 %, in 2020 — 5-30 %. It was revealed that during the flowering period the number of T. tabaci Lind was 1-2 specimens per inflorescence; at the end of flowering, the amount of the pest increased by 5 times. High temperatures and lack of precipitation led to an outbreak of the pest population; in the first decade of June, 15 to 40 individuals were fixed per leaf. A high degree of damage to the tops of shoots, leaves and fruits was observed, the tissue in the feeding places of the pest was deformed, discolored, acquiring the appearance of whitish spots, which grew during the growth and ripening of fruits. It is known that the intensive development of thrips takes place in dry and hot years; the optimum temperature for the development of T. tabaci Lind is +25 °C. As a result of our monitoring, it was revealed that the maximum amount of the pest was observed during the period when high temperatures and low relative air humidity were noted — June and early July. The greatest number of the pest was found in areas bordering the fields of grain and tilled crops, while the number of phytophages at the time of registration reached 45 individuals per leaf and more. It should be noted that when the air temperature rises above +35 °C, the development of the phytophage stops, and the mortality rate of all stages sharply increases. To ensure a stable phytosanitary situation in fruit agrocenoses and prevent loss of fruit quality from damage by thrips, it is necessary to develop a set of measures to control the number of pests.

Investigation of biological plant protection in protected culture of pepper

The aim of the study was to determine the effectiveness of regularly applied biological control by continuous monitoring of pests with the help of color traps (sticky sheets) and flower tests with joint species identification of the useful insect to determine the extent to which native useful insects can settle next to the introduced predatory ones. The latter process is to be facilitated by growing a flowering mixture of annual plants at one of the experimental sites, which provides adequate feeding and hiding place for beneficial insects.The experiment was performed in one pepper forcing period. The main pest insects are: western flower thrips (Frankliniella occidentalis), tobacco thrips (Thrips tabaci).Useful insects in the experiment: predatory mites (Amblyseius spp.) and predatory flower bugs (Orius laevigatus).

Effect of In-Furrow Application of Fluopyram on Leaf Spot Diseases of Peanut

In peanut (Arachis hypogaea) production, in-furrow applications of the pre-mix combination of the SDHI fungicide/nematicide, fluopyram, and the insecticide, imidacloprid are used primarily for management of nematode pests and for preventing feeding damage on foliage caused by tobacco thrips (Frankliniella fusca). Fluopyram is also active against many fungal pathogens. However, the effect of in-furrow applications of fluopyram on early leaf spot (Passalora arachidicola) or late leaf spot (Nothopassalora personata) has not been characterized. The purpose of this study was to determine the effects of in-furrow applications of fluopyram + imidacloprid or fluopyram alone on leaf spot epidemics. Field experiments were conducted in Tifton, GA in 2015, 2016, and 2018-2020. In all experiments in-furrow applications of fluopyram + imidacloprid provided extended suppression of early leaf spot and late leaf spot epidemics compared to the nontreated control. In 2020, there was no difference between the effects of fluopyram + imidacloprid and fluopyram alone on leaf spot epidemics. Results indicated that fluopyram could complement early season leaf spot management programs. Use of in-furrow applications of fluopyram should be considered as an SDHI fungicide application for resistance management purposes.

Effect of Imidacloprid and Acephate for Tobacco Thrips (Thysonaptera: Thripidae) Management on Flumioxazin Injured Peanut

Experiments were conducted in 2016 and 2017 in Stoneville, MS and Starkville, MS to determine the impact of different insecticide management options for thrips on herbicide injured peanut. Insecticide treatments included imidacloprid in-furrow at-planting, one or two foliar applications of acephate, and an untreated control with and without an application of flumioxazin. In Stoneville, herbicide applications were made immediately following planting, and in Starkville, applications were made as plants were emerging to maximize herbicide injury. The Stoneville experiment also had an additional factor in which plots were flooded or not flooded to simulate a heavy rainfall in order to maximize herbicide injury and also to give added stress from saturated soils. Thrips counts, thrips injury ratings, plant vigor ratings, plant biomass, width between plant canopies, and yield were recorded. Few interactions were observed, but temporary flooding, herbicide injury, and thrips injury affected peanut growth as measured by biomass and canopy. Imidacloprid was the most consistent insecticide treatment for reducing thrips numbers and injury, but acephate provided some protection. Temporary flooding during the seedling stage, flumioxazin injury, and thrips injury all reduced peanut pod yield. Based on these results, every attempt should be made to minimize early season stress in peanuts including the use of an effective in-furrow insecticide.

Evaluation of Tillage, At-Planting Treatment, and Nematicide on Tobacco Thrips (Thysanoptera: Thripidae) and Reniform Nematode (Tylenchida: Hoplolamidae) Management in Cotton

There are numerous early-season pests of cotton, Gossypium hirsutum L., that are economically important, including tobacco thrips, Frankliniella fusca (Hinds), and reniform nematode, Rotylenchulus reniformis (Linford & Oliveira). Both of these species have the potential to reduce plant growth and delay crop maturity, ultimately resulting in reduced yields. A field study was conducted during 2015 and 2016 to evaluate the influence of tillage, at-planting insecticide treatment, and nematicide treatment on pest management, cotton development, and yield. Treatment factors consisted of two levels of tillage (no-tillage and conventional tillage); seven levels of at-planting insecticide treatments (imidacloprid, imidacloprid plus thiodicarb, thiamethoxam, thiamethoxam plus abamectin, acephate plus terbufos, aldicarb, and an untreated control); and two levels of nematicide (no nematicide and 1,3-dichloropropene). There were no significant interactions between tillage, at-planting insecticide treatment, or nematicide for any parameters nor was there a difference in the main effect of nematicide on thrips control or damage. The main effects of tillage and at-planting insecticide treatment impacted thrips densities and damage. The no-tillage treatments and aldicarb in-furrow or acephate seed treatment plus terbufos in-furrow significantly reduced thrips populations. Early-season plant response was impacted by tillage and at-planting insecticide treatment; however, that did not result in significant yield differences. In regard to nematicide treatment, the use of 1,3-dichloropropene resulted in lower yields than the untreated.