Averys (Radnage) Ltd - Rocca HEAR
Produced with the kind permission of Rod Avery
Weather data: Premium Crops have sponsored a Sencrop weather monitor in the field and we shall be regularly updating this website with the output from that machine...
The last inspection of the crop at the end of November showed an increased prevalence of Phoma (Figure 2) and the weed groundsel. The Phoma level was no surprise given the significant amount of rain that has fallen over the autumn.
Despite the wet conditions, an application of Belkar at 0.25l/ha and Decoy 250EC (Prothioconazole) at 0.35l/ha was applied on the 28th October 2019. The farms agronomist had prescribed Biscaya (Thiacloprid) for another pass on flea beetle, but Mr Avery decided to leave it out due to doing more damage to helpful insect species than having an effect on flea beetle.
Kerb (Propyzamide) is the next planned application, when cooler and fingers crossed, drier weather will allow the sprayer to travel over the next couple of days. Overall crop growth looks to have all but stopped, mainly due to the water I suspect more than temperature (See image below).
There are some signs of Phoma lesions on older leaves. The download from the Sencrop weather station (see top of page) show just how persistent rain has been since the end of September. Average temperatures are 6.3 °C and are starting to drop, which should help slow disease development and any slug activity.
Rain has provided much needed moisture for crops to grow away from CSFB. Crops are looking good and volunteer cereals are starting to die. CSFB can still be found, but the crop is beyond the most susceptible stage to damage, however in the latest drilled field rows still aren’t visible. The excessive levels of moisture in the fields has slowed the vigour of the crop.
Sprays are now up to date, one field has had Belkar for broad leaved weeds, whilst the rest have had just Fusilade Max for volunteers. The last pyretheroid was applied in early October to keep the CSFB at bay and minimise possible future larvae populations.
Sowing Date(s): First 2/3 = 21st/22nd August and Final 1/3 = 4th September
Sowing Conditions: One third of the crop was drilled on the 4th September and the other two thirds 21-22nd August into a soil that is sandy silt loam using subsoiler followed by Suffolk coultered combination drill with seed passing down every third coulter. The soil type was analysed, and pH found to be high, which means future nutrient applications will be adjusted to apply nutrients that are locked as a result. DAP has been applied to all fields of the crop to aid establishment, and three out of four fields have had an insecticide and graminicide.
Rocca has high autumn vigour which helps the crop get up and away from cabbage stem flea beetle (CSFB) damage and aids establishment in dry conditions. The volunteer cereals have been sprayed off, which will reduce further water loss to the crop from the volunteer cereals.