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Arable Farming
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Are fungicides more harmful than insecticides
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<blockquote data-quote="cquick" data-source="post: 7898432" data-attributes="member: 35800"><p>This could be due to the fungicide killing mycorrhizal fungi or other species in the rhizosphere, where you would reasonably expect a systemic fungicide to be excreted. The resultant mineralisation of nutrients would cause a yield increase. In other words, I would see a yield increase in the absence of disease, to be a bad thing. It shows that there is something going on that we don't fully understand!</p><p></p><p>I think that multiple small applications of non-systemic fungicides, e.g. Folpet, CTL (RIP), applied preventatively to each major leaf as it emerges, is a viable strategy. This way you can use reduced rates as all the chemical has to do is inhibit spore germination. Back when it was legal I used 0.6 CTL four or five times through the season, with 10 - 20 day timings depending on the weather conditions. I had to add a sniff of Teb occasionally for any rust foci, but otherwise it was a very clean and cost effective strategy, coming in at less than £30/ha. The only downside is you need to have the sprayer capacity to get over all your area at short notice.</p><p></p><p>This year I plan to do similar, with 4 applications of half rate Folpet, 1kg elemental sulphur and 1L molasses. My varieties are Extase, Theodore and Graham. If the season starts to break down I can always bring in the 'firehose' chemicals at short notice.</p></blockquote><p></p>
[QUOTE="cquick, post: 7898432, member: 35800"] This could be due to the fungicide killing mycorrhizal fungi or other species in the rhizosphere, where you would reasonably expect a systemic fungicide to be excreted. The resultant mineralisation of nutrients would cause a yield increase. In other words, I would see a yield increase in the absence of disease, to be a bad thing. It shows that there is something going on that we don't fully understand! I think that multiple small applications of non-systemic fungicides, e.g. Folpet, CTL (RIP), applied preventatively to each major leaf as it emerges, is a viable strategy. This way you can use reduced rates as all the chemical has to do is inhibit spore germination. Back when it was legal I used 0.6 CTL four or five times through the season, with 10 - 20 day timings depending on the weather conditions. I had to add a sniff of Teb occasionally for any rust foci, but otherwise it was a very clean and cost effective strategy, coming in at less than £30/ha. The only downside is you need to have the sprayer capacity to get over all your area at short notice. This year I plan to do similar, with 4 applications of half rate Folpet, 1kg elemental sulphur and 1L molasses. My varieties are Extase, Theodore and Graham. If the season starts to break down I can always bring in the 'firehose' chemicals at short notice. [/QUOTE]
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Are fungicides more harmful than insecticides
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