Biological control of the strawberry mite by using predatory mites

Strawberry mite control by Neoseiulus cucumeris has proven economically feasible. To achieve a better integration of biocontrol with growing techniques and outdoor conditions development of alternative approaches by native phytoseiid species are required

Integration of biological mite control into outdoor strawberry production: a matter of efficacy and economy

Ten years experiences in experimental and practical fields prove that effective control of strawberry mite can be achieved by inundative introductions of the predatory mite Amblyseius cucumeris. Lately, Neoseiulus barkeri has been included to experiments compare its efficacy especially in higher strawberry mite densities

Black vine weevil and other wingless weevils: are there any effective conrol methods applicable in outdoor strawberry in Nordic countries?

The black vine weevil (Otiorhynchus sulcatus) is a common pest in Central Europe but rather new on outdoor crops in Finland. Spreading of enthomopathogenic nematodes against weevils by drip irrigation was tested at MTT during 2003-2004. The results proved that at least in small-scale use the nematodes were easily spread through the irrigation system into the field. We were not able to prove the efficiency of the nematodes against larvae because of too low level of both species populations in the experimental cages in the field

Introduction and maintenance of predatory mites as a preventive biocontrol buffer against strawberry tarsonemid mite in greenhouses

We investigated preventive control of the strawberry mite by introduction and maintenance of four species of predatory phytoseiid mites

Heating of strawberry plants for elimination of strawberry tarsonemid mite - possibilities and risks

Hot water treatment of strawberry runners was applied already in the 1950's to control strawberry tarsonemid mite Phytonemus pallidus ssp. fragariae and leaf nematodes Aphelenchoides spp. The hot water technique is effective and safe for cut runners when carefully applied

Mulches and pheromones - plant protection tools for organic black currant production

Different mulches have been studied in organic currant production since 1997 at MTT Ecological Production in S:t Michel. Mulches, especially black plastic, suppressed weeds effectively. Since green mass mulch decomposes fast on the soil surface, it can be recommended mainly as an additional fertilizer. Lepidopterous pests Synanthedon tipuliformis, Euhyponomeutoides albithoracellus and Lampronia capitella are difficult to control even by chemicals. Therefore pheromone-based management was studied in 1999-2003

The effect of different mulches on yield, fruit quality and strawberry mite in organically grown strawberry

An organic strawberry field experiment was started in 2000 at MTT Ecological Production in Mikkeli to study the influence of mulching materials on the growth, yield, microbiological fruit quality and strawberry mite. Mulching materials are black plastic, flax fibre mat, green mass, barley straw, buckwheat husk as well as pine and birch woodchips

Preceding crop has great influence on the density of Pratylenchus crenatus on strawberry

The preceding crop plant has a great influence not only immediately after the cropping but also in long-term on the numbers of Pratylenchus crenatus in strawberry

Efficient computation of the second-Born self-energy using tensor-contraction operations

In the nonequilibrium Green's function approach, the approximation of the correlation self-energy at the second-Born level is of particular interest, since it allows for a maximal speed-up in computational scaling when used together with the Generalized Kadanoff-Baym Ansatz for the Green's function. The present day numerical time-propagation algorithms for the Green's function are able to tackle first principles simulations of atoms and molecules, but they are limited to relatively small systems due to unfavourable scaling of self-energy diagrams with respect to the basis size. We propose an efficient computation of the self-energy diagrams by using tensor-contraction operations to transform the internal summations into functions of external low-level linear algebra libraries. We discuss the achieved computational speed-up in transient electron dynamics in selected molecular systems.Comment: 9 pages, 4 figures, 1 tabl