MSU Extension Hops

Contents

Using the hop management guide .......................................................... 2
Endangered Species Act impacting pesticide labels ........................ 3
Hop exportation considerations for maximum residue levels ........ 3
Growth stages guide ................................................................................... 4
Management activities guide .................................................................... 5
Weed management ...................................................................................... 5
Herbicides ....................................................................................................... 8
Disease scouting calendar ........................................................................ 10
Fungicides ...................................................................................................... 11
Hop downy mildew management .......................................................... 13
Hop cyst nematode management and prevention ........................... 18
Viruses and viroids of hop in Michigan ................................................ 18
Insect pest scouting calendar ................................................................. 21
Insecticides ................................................................................................... 22
Miticides ......................................................................................................... 24
Nutrient management considerations ................................................. 25
Plant SAP analysis ...................................................................................... 29
MSU plant and pest diagnostics ............................................................ 30
Additional hop resources ......................................................................... 32

Using the hop management guide

Information presented here does not supersede the label directions. To protect yourself, others, and the environment, always read the label before applying any pesticide. Although efforts have been made to check the accuracy of information presented, it is the responsibility of the person using this information to verify that it is correct by reading the corresponding pesticide label in its entirety before using the product.

The information presented here is intended as a guide for Michigan hop growers in selecting pesticides and is for educational purposes only. Labels can and do change. For current label and MSDS information, visit one of the following free online databases: greenbook.net, cdms.com, and agrian.com.

The efficacies of products listed have not been evaluated on hop in Michigan. Reference to commercial products or trade names does not imply endorsement by Michigan State University Extension or bias against those not mentioned.

Hop exportation

The US Hop Industry Plant Protection Committee has actively sought harmonization of pesticide regulatory standards (maximum residue levels or MRLs) in key customer countries for the past three decades. As US hops are exported worldwide, ensuring consistent regulatory standards between the US and export customers avoids trade issues and interruption of shipments. US HIPPC also collaborates with other hop producing countries through participation in the International Hop Growers Convention and the European Union Commodity Expert Group for Hops.

Some countries do not allow application of certain plant protection products or have lower MRLs than in the U.S. If you export hops you will need to comply with the relevant international MRLs. Export restrictions may apply to the pesticides included in this guide. Growers planning to export their hops should carefully review the Hop MRL Tracking Chart at https://www.usahops.org/growers/plant-protection.html.