Egg hatch for wheat bulb fly has started and growers are being urged to monitor crops, as last autumn’s survey found one of the highest incidences of eggs being recorded.


The first of the weekly Pestwatch reports issued by Dow AgroSciences and ADAS confirmed that egg hatch had begun in Cambridgeshire, Suffolk and Hertfordshire.

In the week commencing 10 January, egg hatch in Suffolk was 11.1%, in Cambridgeshire/Hertfordshire on mineral soils was 7.1% and in Cambridgeshire on organic land was 1.1%. Egg hatch had yet to start in Norfolk and Yorkshire.

“Eggs are usually laid in mid-July to August and they hatch the following January or February,” says Sarah Hurry of Dow AgroSciences.

But results from the HGCA 2010 autumn survey showed the numbers detected were the highest recorded since 2004 and the fourth highest since monitoring began in 1984.

“This means that growers should remain vigilant. They should use the risk assessment charts to identify fields at risk and be ready to treat vulnerable fields.”

Weekly reports can be accessed here.