9th Monilinia Update for Nova Scotia

Friday, May 24, 2019

It has been a challenging spring to say the least, wind, rain and cold conditions have made pest control and the timing of pest control a challenge.

I took some bud counts on high inland fields over the last two days and those fields are well over 50% F2.  With the exception of a few late fields in Cape Breton, all fields are beyond the threshold stage. 

Given the cool damp conditions and the slowed development of the fields, we can assume apothecia cups are still producing spores in most fields.  For much of central Cumberland and Colchester we are approaching the end of Monilinia risk for the season, but we are not there yet. We need heat to dry up the cups and to push floral development along. We are still likely 5 days away from significant bloom appearing.

If you have not put on a product to control Monilina yet, now is the time.

Based on growing degree model tracking (using base 0)  Debert is about 5 days behind last year from a heat accumulation standpoint.  We should be just starting to see plants pop through the ground in sprout fields.

Reminder:  Twilight meetings are a go next week

May 27 - Millen Farms, Little Dyke (5:00 pm start)
May 28 - John Cameron's Receiving Shed, East River St. Mary's (5:00 pm start)
May 30 - Art Sargent's Receiving Shed, Parrsboro (5:00 pm start)

The next update will be mid-day on Tuesday, May 28th

8th Monilinia Update for Nova Scotia

Tuesday, May 21, 2019

We are in the middle of an extended infection period or a series of them depending on your location. It has been wet since early on Monday, May 20 and it is expected to stay wet through to mid-day on Wednesday, May 22. With almost all fields in mainland Nova Scotia beyond the 40-50% V2/F2 threshold, controls should be considered.

Again, products applied just prior to an infection period tend to give 7-10 days of protection. Proline and propiconazole based products do give some control "back-action" if applied after the infection. You can't count on back action, longer than a couple of days however.

Cape Breton still has some areas that are not quite at that critical stage.

Two areas reporting from Cape Breton are:

Foote Cape - 24% F2 (May 19th)
Egypt Mt. - 0% F2 (May 19th)

We can consider apothecia cups still active and viable at this point, for much of the province

South West Nova Scotia should be approaching the end of Monilinia blight season and infection risk should be decreasing in that region.

The next update will be late in the day on Friday, May 24th.

7th Monilinia Update for Nova Scotia

Friday, May 17, 2019

Almost all areas in mainland Nova Scotia are under risk for infection from monilinia. With the exception of a few very late fields, fields are at or beyond the 40-50% F2 V2 stage.  There is a forecasted rainfall event overnight tonight into mid day on Saturday.  There is also an expected rainfall event overnight Sunday into Monday, possibly continuing on into Tuesday.  This will likely mean several infection periods in most regions, especially as temperatures start to go up..

If an application has been made this week, it will provide 7-10 days of protection for the buds that were open at the time of application.

If an applications are delayed until Wednesday of next week, it is unrealistic to expect back action that extends back to the weekend, to cover off the infection periods.

This is a critical time for Monilinia Risk in Nova Scotia.

Also of note, weeds are finally starting to move, the cold soil temperatures have slowed weed growth and plant development.  As of yet, we have not seen any blueberry plants emerge in sprout fields in central Nova Scotia.

The next update will be late in the day on Tuesday, May 21st.

6th Monilinia Update for Nova Scotia

Tuesday, May 14, 2019

We are certainly looking at an infection period from Tuesday mid-day through late in the day on Wednesday.  There also appears to be another wet period approaching on Saturday, which could be an infection period.

Most fields, except traditionally later fields (ie. high fields, cape breton and areas towards advocate) are at or beyond the critical 40-50% F2/V2 stage.

Crop development has slowed considerably with the cold temperatures and cold soils.  Grasses are just starting to move and I have yet to see a blueberry plant begin to push through the ground on any sprout fields.

Areas reporting on fruit bud development:

Halfway river - 26-67% F2
Airport Field Parrsboro - 43% F2
Parrsboro shore/advocate - 23-25% F2
Springhill - 36-49% F2
Amherst - 49-59% F2

Central Colchester and Halifax counties are beyond the 40-50% stage with the exception of a few very late fields.

We are certainly in the heart of Monilinia season and controls should be considered if your field is at the right stage.

The next update will be late in the day on Friday, May 17th.

5th Monilinia Update for Nova Scotia

Friday, May 10, 2019

We are fully expecting an infection period Friday evening into Saturday with 10-15 mm expected.  There is also another forecasted weather event coming on Tuesday.

Many traditionally early fields in central NS are approaching or are at the 40-50% F2 stage and control measure should be considered.

This stem taken from a field in Mt. Thom this afternoon, has five fruit buds all at or beyond the F2 stage.  This field had 40% of it's buds at the F2 stage. In a normal year is considered at later field.

We are still seeing field development that does not make sense according to traditional field development progression.  Winter damaged fields are still lagging behind traditionally later fields.

Here are a list of reporting sites from this week.

Musquodoboit - 55% F2

Mt. Thom - 40% F2

Oxford - 33-63% F2

Williamsdale - 25-52% F2

Farmington - 15-22% F2

Pigeon Hill - 14.9-25% F2

Advocate - 3% F2

Parrsboro Airport - 15% F2

The next update will be late in the day on Tuesday, May 14th.

4th Monilinia Update for Nova Scotia

Tuesday, May 7, 2019

If you are above the 40-50% V2 F2 bud stage, tonight will likely be an infection period.

However, most fields are not far enough along to warrant an application.

Many fields could be ready as the next rainfall event approaches on Friday into Saturday.

Proline and Propiconazole based products (Tilt, Topas, Jade, Bumper etc.) are the main products of choice for controlling Monilinia.  Contact your buyer to see which products are allowable for their markets.

Propiconazole based products do have 2-3 days of back action from the start of an infection period. It is unclear how much back action Proline gives, but it is believed there is some.

Below is an update of fields and regions.

Stewiacke - 31% F2
Middle Musquodoboit - 10-22% F2
Benvie Hill - 18% F2

Mt. Thom - 17% F2

Amherst - 26-30% F2
Athol - 24-28% F2
Springhill - 17-20% F2
Mapleton - 11-15% F2
Oxford - 28-52% F2
Farmington - 14-18% F2
Westchester - 28-31% F2

Lakelands - 30% F2

We are rapidly approach the critical development period in most areas including areas east of Mt. Thom and in coastal areas.  All farmers should be looking at their fields to determine bud development.

The next update will be late in the day on Friday, May 10th.

3rd Monilinia Update for Nova Scotia

Friday, May 3, 2019

We are seeing very variable field development across the region.  Generally speaking, fields that have had severe winter injury appear to be developing slower than fields that escaped without a lot of damage. It is important to check your fields now, to not only determine the severity of injury on your fields but to determine how developed your fruit and vegetative buds are.

As of yesterday, our first active apothecia cup was noticed.  So if there is a wet period of significant length spores will be released.  However, it does not make economic sense to treat fields that are less than the 40% F2 V2 stages.

Below is a report of fields and regions across Nova Scotia:

East Kemp - 33% F2
Queen's County - 40% F2

Musquodoboit - 8-20% F2
Benvie Hill - 14-22% F2
Stewart Hill - 16% F2

Camden - 17% F2

Oxford (wood field) - 22.5% F2
Mt. Pleasant (Smith) - 21% F2
Amherst - 11-14% F2
Athol - 11.8 - 20.5% F2
South Hampton - 14-20% F2
Rose Corner - 17.8% F2
Westchester - 10-20.5% F2

Average bud counts are lower than in previous years, with numbers of viable buds ranging from 2-6 in many fields.

We are seeing some winter damage in almost every field, but damage is quite variable from field to field. A note to consider, a field with good plant density and an average bud count of 4 can still get a good yield, if disease protection and pollination are looked after.

There is a forecasted rainfall event for Friday night and through noon on Saturday, however, most fields are not at a stage that would warrant a treatment this weekend.

There could be a rainfall event on Tuesday, given the forecasted temperatures, plant development could push many areas beyond the 40% F2 stage by then.  I expect we will need to begin treating for monilinia next week.

The next update will be late in the afternoon on Tuesday, May 7th.