Preparing for T1 and OSR fungicide applications at Newark
Location - Newark
Date - 10.04.17
Winter wheat T1 timed for next week with L3 currently between 50% and fully emerged depending on variety. Yellow rust only in susceptible varieties. Septoria very easy to find in all varieties on lower leaves which are adjacent to new growth.
Graham and Shabras have very low levels of disease and are looking well:
Graham spray paint from T0 application – shows there has been a lot of new growth in 10 days:
Graham leaf 3 nearly fully emerged. Distribution of spray paint all over leaf 4 demonstrates that T0 was well timed to protect leaf 4.
Dickens and KWS Santiago leaf 3 only 50% emerged, so need to tailor T1 application timings to variety and disease pressure.
Winter barley T1 now, hybrid barleys have grown extremely quickly with this warm weather increasing potential lodging risk; low disease levels. If crops didn’t receive a T0 PGR the length of the internodes will be very long and a robust PGR treatment should be applied to thicken the stems and make sure further internodes are reduced (reducing the risk of lodging). T1 application of MODDUS and chlormequat will be key. Higher rates of Moddus should be used in high risk areas and if no T0 PGR has been applied.
Hybrid barleys at GS 32, they have grown very quickly and have a very lush canopy.
The good growing conditions meant oilseed rape crops started flowering earlier than normal (10 days – 2 weeks). After a warm weekend early April the temperatures have dropped to more normal levels with cold nights, which could mean we have a protracted flowering period. This could mean crops are at risk from Sclerotinia for a longer period of time than normal. Currently risk levels are moderate in the west (where there has been more rain) and low in the east. How the risk progresses is notoriously hard to predict, but an application of AMISTAR will also give green benefits to drive yield and oil content in the absence of disease.
We will be applying AMISTAR at early to mid-flower in mix with a triazole (prothioconazole) to help reduce Sclerotinia and also Verticillium wilt. If flowering is protracted then a second spray may be required to keep protection through until the end of flowering. Light leaf spot levels in OSR are much lower than last season.
TOPREX height and flowering effects evident from application at GS31 (stem extension):
Crop architecture is the foundation for higher yields:
- Shorter crop -> reduced lodging and less shading
- Greater branching -> supports more pods
- Shorter flowering period -> more light reaches the leaf
Shorter plants and greater branching with TOPREX sets oilseed rape plants up to capture more sunlight. More even crops flower over a shorter period, with less light reflecting from the yellow petals and more light reaching the green leaf.
Spring barley and spring beans have emerged quickly and are developing quickly with the warm weather.
Pea and bean weevils migrating into crops. With temperatures reaching above 15oC check crops for characteristic leaf notching. Once weevils have reached threshold levels of 30 weevils caught in traps on a single recording day we will spray with HALLMARK ZEON.
Spring beans emerging; low pea and bean weevil notching at present.