2017 Fruit Pest Update

April 19, 2017

Click to link to

2017 Midwest Fruit Pest Management Guide

Apple and tart cherry are at green tip here at the Research Station.

The warm temperatures over the past weekend pushed tree fruit bud development. Critical temperature ranges for flower bud damage are currently -20°F to -25°F for tart cherry and apple at the green tip stage of development.

Tree Fruit – Critical Temperatures

Degree day accumulation is running very close to average for this time of year.

Degree day comparison 2013-2017
Date 4/18 2013 2014 2015 2016 2017 20 yr avg
Base 50 5 22 60 53 61 59

INSECT & DISEASE CONTROL 

APPLE

Disease Pressure – With green tissue now present, apple scab susceptible varieties will need to be protected during future infection events. Scab infections from light to heavy were recorded at weather stations south and north on the peninsula but not in the Southern Door area where rainfall totals were much lighter. The rain forecast for the next 24 hours could bring the next infections.

Insect Pressure – Green fruit worm adults are flying but have not yet begun to lay eggs. It will become more critical to scout for their larva starting at tight cluster through petal fall.

CHERRY

Disease Pressure – Little to worry about because of plant stage.

Insect Pressure – Green fruit worm adults are flying but will not need to be scouted for until bloom.

GRAPE

Disease Pressure – Little to worry about because of plant stage.

Insect Pressure – Check back for reports as the season progresses.

Links to individual Enviro-Weather stations:

Casco   Southern Door   Sturgeon Bay   Egg Harbor   W Jacksonport   Sister Bay

Kewaunee/Stangelville   Sturgeon Bay/Southern Door