New DK

This document shows the effect of crop rotation on diseases, weed and pests. In potatoes, rotations affect primarily potato cyst nematode, common scab, rhizoctonia and potato late blight. The purpose of rotating crops is to ensure a sustainable production and reduce a negative impact of diseases, weed and pests. Information on crop rotation, pre-crop, reduced soil treatment, recommended length of crop rotation, use of green manure cropping and reduced soil treatments, as well as the interactions, is given. 

This document provides general growing instructions for starch potato which include e.g. seed bed preparation, use of fertilisers, plant protection strategies, irrigation, harvest, storage etc. The growing instruction describes the process from planning seed bed preparation, plant protection strategies to production and sale. The goal of growing starch potatoes is a big yield of tubers with a high content of starch. Under Danish conditions this mean approximately 500-600 hkg/ha and a starch percent at 18-19.

This internet based tool provides information on the possible combinations of pesticides as tank mixtures. The table is an extract of the official database of approved plant protection products in Denmark, and is always up to date. There is further link to other crops and to the specifications of the different pesticide. The access to this database is currently free of charge, and an up-to-date version of the mixture table may be found at: http://www.lr.dk/middeldatabasen/CompatibilityTable.asp?CropID=1

New dk

This document provides information on three methods for mechanical weed control; rolling cultivator, harrowing and earthing and covering by gradual earthing of potatoes. Potatoes have a low competitive ability against weed until rows closing. High weed densities at harvest reduce both the harvest capacity and increase the amount of waste potatoes.

new dk

This document provides information on the effect of different fungicides on oospores of potato late blight (Phytophthora infestans). The newsletter is a summary of a Dutch investigation presented at the EAPR conference in 2002. The investigation shows that almost all plant protection products in Denmark approved for control of potato late blight are effective against oospores. Seven plant protection products and the number of oospores after treatment with different fungicides are listed in a table. The investigation shows that oospores are an important source of primary inoculum in the lifecycle of potato late blight.

New DK

This document provides a description of different kind of phytotoxicity or russeting as side effect of foliar sprays with pesticides in potatoes. The impact on yield and quality is influenced by dosage, growing conditions, time of spraying and the growth stage of the plant. For pesticides which inhibit cell division, the leaf damages are stronger when the plant is the early and rapid growth stage. The different types of damage are listed according to where the symptoms are seen. Links to photos showing different kinds of phytotoxicity are included.

New document

This document provides information on different control strategies for weed control, time of application, dosage, suitable herbicides, treatment frequency index, prices on herbicides and a short instruction in relation to the spraying strategy. Plant protection products are given for different groups/species of different weeds. This document is a part of the official database on plant protection products in Denmark which is updated on a regular basis. The access to this database is currently free of charge, and an up-to-date version may be found at:
http://www.lr.dk/Middeldatabasen/GuideTable_PO.asp?id=124

This document provides information on different component in a DSS used in the control of potato late blight (Phytophthora infestans). This include internet based registration net for the first occurrence of blight in the field, daily risk values for blight based on three days historical and two days forecast values. Risk values are disseminated to the growers via an SMS service. Different links are listed e.g. prediction of spraying conditions, results from Euroblight, NJF seminars etc. Some of the services at this site require membership.  If you are a subscriber, the dynamic web page may be found at www.planteinfo.dk by following the menu path  Afgrøder > Kartofler > Kartoffelskimmel test

New document

This document provides information on different spraying nozzles and spraying techniques in potatoes. Deposition and penetration is measured by a tracer (sodium flourecein). Water sensitive papers and Tinopal/UV light are used to visualize where the spray liquid is deposited. Generally, droplets from Danfoil air-sprayers and Hardi TWIN air-assisted sprayers display the highest penetration and deposit the highest amount of tracers in the potato canopy compared to other techniques. Under windy conditions, a traditional sprayer with compact air induction nozzles deposits the same amount of tracers in the canopy as the air- and air-assisted sprayer.

New document

This document provides information about strategies for chemical weed control in potatoes. The efficacy of the four currently registered herbicides (Command CS (clomazone), Fenix (aclonifen), Boxer EC (prosulfocarb) and Titus WSB (rimsulfuron)) on different monocotyledonous and dicotyledonous weed species are scored on a scale from 1-9 and listed in a table. The weed density and presence of difficult-to-control weed species determines the choice of PPP. There is, however, little difference in efficacy between strategies when different herbicides are combined to cover both the monocot and dicotyledonous weed species. Timing is the crucial factor for a good result.