Think You Have a Root Lesion Nematode Problem in Your Ginseng? Think Again

We constantly get reports of significant root lesion nematode problems in ginseng, mostly based on the appearance of rusty symptoms and/or constrictions on roots. However, when ginseng fields are tested for nematodes beyond ginseng germination, we rarely can find any nematodes present. The purpose of this article is not to say that root lesion nematodes are not an issue in ginseng, because they are. However, they are probably not an issue once the symptoms are present in the field, and many growers do not have an issue with them at all. Before you waste money on unnecessary treatments, consider the following: Continue reading

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Hop Workshops Update – Eastern Ontario workshop cancelled, western workshops proceeding as scheduled

 

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Managing Multiple Diseases at Once in Ginseng – Crop Update, June 20, 2019

This has been a challenging year for disease management in ginseng. In addition to the earlier issues with root diseases, especially Phytophthora, we are now dealing with high pressures of Alternaria (Figure 1) and Botrytis (Figure 2). It can be difficult to manage all these issues at the same time, especially when dealing with both root and foliar disease. Frequent rainy periods also make it difficult to time sprays properly and to know whether previous sprays have washed off. Here are some things to think about to ensure protection from all these diseases while not wasting money on unneeded sprays.


Figure 1. Alternaria lesion on a ginseng stem

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Got coverage? Register now to improve spray coverage in hops for more effective pest control

Registration deadlines for next week’s hops sprayer workshops are rapidly approaching.  Note that these workshops could be cancelled if minimum registration numbers are not reached by the deadlines. See the bottom of this article for details on the workshops and how to register.

Why should hop growers care about spray coverage?

Read through any hop pesticide label and you will likely find multiple statements about thorough coverage being required for effective pest control, however achieving good coverage can be very challenging when you are dealing with a crop that grows from rhizomes to 18 feet tall in just a few months. When disease risk is high, growers often feel rushed to apply pest control products in a timely fashion. However it is important to remember that, in the case of coverage, the adage “something is better than nothing” does not always apply to many of the more significant hop pests.

For example, with both downy and powdery mildew, pest control products registered on hops in Ontario are essentially preventative. This means that they work by preventing fungal spores from invading healthy tissue, rather than curing infections that are already there. If poor coverage means that only part of the crop is protected, then disease spores can still invade unprotected tissue, potentially resulting in systemic infections which you could be dealing with for many growing seasons.

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Updated Pest Control Products List for Hops 2019

Below is an updated list of pest control products registered for use on hops in Ontario including a few registrations just received in the last few weeks.  The full list can be found by clicking on the link below.

Hops Pesticides 2019

New products for 2019 are: Sluggo Professional for slugs,  the fungicides Presidio and Parasol WG (both for downy mildew) and the herbicide Chateau (for pre-emergent weed control in dormant hops and sucker control). Additionally, leafhoppers have been added to the label for Sivanto Prime, which was previously registered on hops for the control of aphids.

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Last chance to register for Eastern Hop Field day

The first hop field workshop of 2019 is scheduled for next Tuesday, June 18th at MacKinnon Brothers Brewing Company in Bath. We currently have not met the minimum registration numbers to run this event.  To avoid cancellation, any growers or industry members who were planning on attending this event should register by the deadline of tomorrow, Friday June 14, at noon.   To register for this or any other OMAFRA hop workshop, contact the Agriculture Information Contact Centre at: 1-877-424-1300 or by email at ag.info.omafra@ontario.ca.

Additionally, we have added a fourth workshop at the Simcoe Research Station which will feature University of Guelph hop downy mildew research results and a sprayer optimization session for western Ontario growers.  Below is the full list of hop field workshops being offered for 2019.

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Managing Phytophthora Leaf Blight – Ginseng Crop Update – May 31, 2019

The persistent wet and cool conditions have resulted in very high risk of foliar Phytophthora. After the wet conditions last fall and this spring, there is a high amount of inoculum of Phytophthora in low areas in most gardens. When there is free water or saturated soils, the swimming spores of Phytophthora can be easily splashed onto the leaves, which results in a foliar infection if the leaf remains wet for a few hours. After a week or so of development in the leaves, sporangia of the fungus, which are pouches full of swimming zoospores, are formed daily on the outside of the leaves and are easily blown on the wind. When these sporangia land on a leaf surface, they just need a few hours of wetness to infect. Spores that wash into the soil from these leaves can result in new root infections even in areas of the garden that are not normally prone to the disease. Continue reading

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