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31/01/2008 19:25:53
Potential control of Potato Apples with Nirvana in Birds Eye Trials
As well as controlling many problem weeds in vining peas, Birds Eye have had positive experience in their technical trials with the pre-emergence herbicide Nirvana in reducing the critical problem of potato volunteers in the crop.
Andrew Whiting, Agronomy Manager for Birds Eye, says that contamination of peas with potato berries can result in rejection of the crop in the field and the factory. "Potato berries are similar size and colour to peas and are produced by potato tubers left in the soil from a previous crop. Some varieties of potatoes are more prolific in their ability to produce berries, with Desiree, Cara and Maris Piper producing high numbers. For vining pea growers it is essential that they minimize, or even eradicate the problem. The fact that we have identified a product that appears to reduce potato apples by controlling volunteers is an important trials discovery."
Andrew explains that, as part of their wide-ranging trials programme to support their vining pea growers, a trial was laid down last year in which potatoes were planted and peas drilled over them. "The pre-emergence herbicide Nirvana was applied and the potato biomass and berry count carried out prior to the pea harvest. The results were astonishingly good. The number of potato berries was reduced from 110 in the untreated down to just 15 in the Nirvana plots, giving a control level of 86%. We now have to determine if this one-off trial was purely chance in a very unusual year or is a genuine strength of Nirvana under field conditions. In 2008 we will carry out more extensive trials before we recommend to our growers the use of Nirvana as an effective product to limit the potato problem in vining peas."
Volunteer Potato
Untreated Nirvana
No. of plants 25 22
Weight of plants (g)
(minus berries) 4035.5 1932
No. of flowers
and buds 108 7
No. of berries 110 15
Weight of berries (g) 304.5 72.5
No. of tubers 161 134
Weight of tubers (g) 8649.5 4415.5
Containing imazamox and pendimethalin, Nirvana was new to the market last year and is recommended pre-emergence in all varieties of vining peas as well as combining peas, winter and spring beans. "Pre-emergence usage suits vining peas as it removes competition early and minimises any risk of crop effects. Nirvana has been tested by PGRO over a number of years and has been found to be completely safe on 53 varieties of vining peas, with no taints being detected. Its excellent crop safety and lack of varietal restrictions makes Nirvana a flexible and easy product to introduce into this years weed control programme," says John Young, BASF Legume Product Manager.
"Nirvana controls the most important weeds in peas including Black-bindweed, Charlock, Common Poppy, Fat-hen, Knotgrass, Orache and Redshank as well as Common Chickweed, Fumitory, Henbit Dead-nettle, Speedwells, Red Dead-nettle and Scarlet Pimpernel. Imazamox enhances the control of several key weeds, such as Charlock, Black-bindweed, Cleavers and Volunteer Oilseed rape, compared with equivalent rates of straight pendimethalin," explains John.
"In vining peas, dose rates for Nirvana are matched to soil type. For light soils, between 2.5 to 3.0 l/ha is recommended, whilst on medium to heavy soils 3.0 to 3.5 l/ha should be used. Where Black nightshade is a severe threat in vining peas, a post-emergence follow-up spray may be called for, in which case a programme of 3.0 l/ha of Nirvana pre-emergence followed by Basagran SG post-emergence is recommended," says John.
John points out that UK growers have now lost several popular and effective pulse herbicides this year. "For this reason Nirvana is a very useful replacement product with the potential to fill some gaps arising from revocation and loss of active ingredients." The choice of legume herbicides is now much reduced as simazine, Reflex T (terbutryn + fomesafen), Opogard/Battalion (terbutryn + terbuthylazine), Fortrol (cyanazine) and Bullet (cyanazine + pendimethalin) are no longer available. Up until this year, Fortrol + Trifolex-Tra (MCPB + MCPA) was a useful option for preventing potato berry production. But Trifolex-Tra and Pulsar have also been withdrawn because of their dependence on Fortrol.
Background Notes - Nirvana contains 16.7 g/l of imazamox and 250 g/l of pendimethalin, formulated as an emulsifiable concentrate, packed in 10 litre containers. It is recommended in combining peas, vining peas, spring field beans and winter field beans for the control of broad-leaved weeds including Black-bindweed, Charlock, Common chickweed, Common Field Speedwell, Common Fumitory, Common Poppy, Fat-hen, Henbit Dead-nettle, Ivy-leaved Speedwell, Knotgrass, Orache, Red Dead-nettle, Redshank and Scarlet Pimpernel. Nirvana is applied pre-emergence of the crop at a dose rate between 2.5 – 4.5 l/ha in 200 – 300 litres of water per hectare, with the dose rate depending on the crop, weed pressure, weed spectrum and length of persistence required.
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Andrew Whiting, Agronomy Manager for Birds Eye, says that contamination of peas with potato berries can result in rejection of the crop in the field and the factory. "Potato berries are similar size and colour to peas and are produced by potato tubers left in the soil from a previous crop. Some varieties of potatoes are more prolific in their ability to produce berries, with Desiree, Cara and Maris Piper producing high numbers. For vining pea growers it is essential that they minimize, or even eradicate the problem. The fact that we have identified a product that appears to reduce potato apples by controlling volunteers is an important trials discovery."
Andrew explains that, as part of their wide-ranging trials programme to support their vining pea growers, a trial was laid down last year in which potatoes were planted and peas drilled over them. "The pre-emergence herbicide Nirvana was applied and the potato biomass and berry count carried out prior to the pea harvest. The results were astonishingly good. The number of potato berries was reduced from 110 in the untreated down to just 15 in the Nirvana plots, giving a control level of 86%. We now have to determine if this one-off trial was purely chance in a very unusual year or is a genuine strength of Nirvana under field conditions. In 2008 we will carry out more extensive trials before we recommend to our growers the use of Nirvana as an effective product to limit the potato problem in vining peas."
Volunteer Potato
Untreated Nirvana
No. of plants 25 22
Weight of plants (g)
(minus berries) 4035.5 1932
No. of flowers
and buds 108 7
No. of berries 110 15
Weight of berries (g) 304.5 72.5
No. of tubers 161 134
Weight of tubers (g) 8649.5 4415.5
Containing imazamox and pendimethalin, Nirvana was new to the market last year and is recommended pre-emergence in all varieties of vining peas as well as combining peas, winter and spring beans. "Pre-emergence usage suits vining peas as it removes competition early and minimises any risk of crop effects. Nirvana has been tested by PGRO over a number of years and has been found to be completely safe on 53 varieties of vining peas, with no taints being detected. Its excellent crop safety and lack of varietal restrictions makes Nirvana a flexible and easy product to introduce into this years weed control programme," says John Young, BASF Legume Product Manager.
"Nirvana controls the most important weeds in peas including Black-bindweed, Charlock, Common Poppy, Fat-hen, Knotgrass, Orache and Redshank as well as Common Chickweed, Fumitory, Henbit Dead-nettle, Speedwells, Red Dead-nettle and Scarlet Pimpernel. Imazamox enhances the control of several key weeds, such as Charlock, Black-bindweed, Cleavers and Volunteer Oilseed rape, compared with equivalent rates of straight pendimethalin," explains John.
"In vining peas, dose rates for Nirvana are matched to soil type. For light soils, between 2.5 to 3.0 l/ha is recommended, whilst on medium to heavy soils 3.0 to 3.5 l/ha should be used. Where Black nightshade is a severe threat in vining peas, a post-emergence follow-up spray may be called for, in which case a programme of 3.0 l/ha of Nirvana pre-emergence followed by Basagran SG post-emergence is recommended," says John.
John points out that UK growers have now lost several popular and effective pulse herbicides this year. "For this reason Nirvana is a very useful replacement product with the potential to fill some gaps arising from revocation and loss of active ingredients." The choice of legume herbicides is now much reduced as simazine, Reflex T (terbutryn + fomesafen), Opogard/Battalion (terbutryn + terbuthylazine), Fortrol (cyanazine) and Bullet (cyanazine + pendimethalin) are no longer available. Up until this year, Fortrol + Trifolex-Tra (MCPB + MCPA) was a useful option for preventing potato berry production. But Trifolex-Tra and Pulsar have also been withdrawn because of their dependence on Fortrol.
Background Notes - Nirvana contains 16.7 g/l of imazamox and 250 g/l of pendimethalin, formulated as an emulsifiable concentrate, packed in 10 litre containers. It is recommended in combining peas, vining peas, spring field beans and winter field beans for the control of broad-leaved weeds including Black-bindweed, Charlock, Common chickweed, Common Field Speedwell, Common Fumitory, Common Poppy, Fat-hen, Henbit Dead-nettle, Ivy-leaved Speedwell, Knotgrass, Orache, Red Dead-nettle, Redshank and Scarlet Pimpernel. Nirvana is applied pre-emergence of the crop at a dose rate between 2.5 – 4.5 l/ha in 200 – 300 litres of water per hectare, with the dose rate depending on the crop, weed pressure, weed spectrum and length of persistence required.
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