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CRT SA : Super Summer Savings 2012
There’s always better value at CRT. With this year’s summer crop planted and growing, the issue of which insecticide to use is always a key question for agronomists and farmers. The biggest factor in making this decision is anticipating which insects are likely to infest crops. This early in the season it’s always difficult to pinpoint the main insect threats but for many cotton growers and horticultural producers Silver Leaf Whitefly (SLW) is traditionally one of the harder to manage pests. The major issue with SLW is that they have developed resistance to a range of insecticides relatively quickly. This is a real issue in horticultural crops, such as tomatoes, where a number of new actives are now ineffective. Cotton growers are in a better position as they are seeing a slightly different response compared to tomato producers at Bowen. Queensland Government testing carried out by DAFF found that SLW in cotton regions were still susceptible to Admiral (Sumitomo), Pegasus (Syngenta), Movento (Bayer CropScience) and Talstar (FMC Australasia). However, in horticultural regions, including Bowen and the Burdekin where there has been widespread use of insecticides, SLW has developed resistance to both bifenthrin and Admiral. In cotton crops, the key product for successful control of SLW is Admiral, an insect growth regulator. It is selective on SLW and provides very effective control. Most importantly, Admiral should only be used once in a season as part of an overall resistance management strategy. Most insect pest management programs for SLW are based on sampling and an understanding of what stage the crop is at with heat degree days. (See matrix below for details.) Weed management can also assist with the control of SLW as all host plants can increase the risk of SLW outbreaks. Major weeds which host SLW include sow thistle, melons, bladder ketmia, etc, as well as volunteer crops of sunflowers and cotton. Other hosts for SLW include soybeans, sunflowers and cucurbit crops. For more information on the management of SLW, or other cotton or horticultural pests in your area, contact your local CRT CottonFocus or CRT HortiFocus agronomist. Information in this article has been sourced from the Cotton CRC Pest Management Guide 2011-2012 and The Beatsheet (DAFF Qld). Crop Protection Controlling Silver Leaf Whitefly PEAKFLOWERINGOPENCOTTON zONE 3A Delay Treatment zONE 3B IGR zONE 2A Suppression zONE 1 No Control zONE 3C IGR + Knockdown zONE 2B Knockdown Matrix courtesy of Australian Cotton Industry Pest Management Guide. Sampling Protocol Sample 20 leaves 3rd, 4th or 5th node below the terminal/25 ha weekly from first flower (777 DD) and twice weekly from peak flowering (1300 DD). Convert to % Infested leaves. Infested leaves are those with 2 or more adults. Uninfested leaves are those with 0 or 1 adult. Day Degrees Daily Day Degrees (DD) are calculated using the formula; DD = [(Max °C – 12) + (Min °C – 12)] ÷ 2 For day degree information from your nearest SILO weather station visit www.cottassist.cottoncrc.org.au For a mid-September planting in Emerald, long term average weather data predicts the duration of Zone 3A is 9 days, Zone 3B is 11 days and Zone 3C is 14 days.
Spring Big Brands 2012
Winning Autumn Deals 2013