Purdue Cooperative Extension Service
Issue 2, April 15, 2016 • USDA-NIFA Extension IPM Grant
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Plant parasitic nematodes are microscopic worm-like organisms that require water to survive and are sensitive to high temperature. Only living nematodes can be extracted from roots. Through the years we have had many samples submitted to the Purdue Nematology Laboratory with little consistency in the quality of the samples. We have discussed proper sampling procedures at every opportunity but not exclusively until now. Sampling might appear trivial but we believe proper sampling is the most crucial step for correct diagnosis. Because we continue to receive improper samples we address this issue again via this article. Even though procedures for sampling among the most important plant parasitic nematodes are similar, there are differences based on the host and the type of nematodes we are trying to recover.
Corn Parasitic Nematodes: There are three major groups of nematodes that parasitize corn.
Soybean Parasitic Nematodes: Lesion and Lance nematodes parasitize soybean too but Needle nematode does not. The sampling procedure for these nematodes in soybean is similar to the one described for corn. The most economically important nematode affecting soybean is the Soybean Cyst Nematode (SCN). The SCN distribution, as for most of the plant parasitic nematodes, is in patches. So it is very important to take many sub-samples to increase possibility of hitting the concentrated areas. A soil probe or a small trawl should be used to collect the sub-samples. Most of these nematodes are within 6-8 inches of the soil. One sample for every 10 acres is ideal. A quart of soil is sufficient and no root samples are required for SCN. Samples can be taken anytime.
Recommended optimum sampling type and time for major plant parasitic nematodes in Indiana. |
---|
Host | Target Nematode | Sample Type | Optimum Time to Sample |
---|---|---|---|
Corn |
Needle |
Soil and roots |
June-mid July |
Corn |
Lesion, Lance |
Soil and roots |
Late June-Late August |
Soybean |
Lesion, Lance |
Soil and roots |
Late June-Late August |
Soybean |
SCN |
Soil |
Anytime |
Turf |
All |
Soil and roots |
June and September |
Melons |
Root knot |
Roots |
At harvest |
Mint |
Lesion |
Roots and soil |
Late June-September |
Mint |
Needle |
Roots and soil |
Late Spring or early fall |
Mint |
Root knot |
Roots |
Fall |
Several of our pheromone trapping cooperators throughout the state captured some black cutworm moths before the recent freezing temperatures - refer to the “Black Cutworm Adult Pheromone Trap Report” for details. The pleasant weather a few weeks ago obviously blew in moths from the southwestern portions of the country. However, the majority of those early arrivals and any eggs laid have likely perished; being a southern migrant they aren’t cold-hardy as our overwintering species (e.g., variegated cutworm). This is good news, although more moths will continue to arrive on future storm systems. Thanks to our trapping cooperators that will keep us abreast of future flights.
Moth arrival, along with the use of heat units to predict the beginning of larval activity, gives us an indication of potential severity of the problem and locations of concern. Thus, we are able to predict with some degree of accuracy when and where crop damage is likely to occur based on these data. We will track heat unit accumulations and predicted damage for your area in future issues of the Pest&Crop. Happy Scouting!
County | Cooperator | BCW Trapped | |
---|---|---|---|
Week 1 3/31/16 - 4/6/16 |
Week 2 4/7/16 - 4/13/16 |
||
Adams | Kaminsky/New Era Ag | 6 | 6 |
Adams | Roe/Mercer Landmark | 3 | |
Allen | Anderson/Syngenta Seed | 0 | 0 |
Allen | Gynn/Southwind Farms | 0 | 0 |
Allen | Kneubuhler/G&K Concepts | 0 | 0 |
Bartholomew | Bush/Pioneer Hybrids | 0 | 0 |
Clay | Bower/Ceres Solutions - Clay City | 0 | 0 |
Clay | Bower/Ceres Solutions - Clinton | 0 | 0 |
Clay | Bower/Ceres Solutions - Bowling Green | 0 | |
Clinton | Emanuel/Boone Co. CES | 0 | 2 |
Clinton | Foster/Purdue Entomology | 0 | 0 |
DeKalb | Hoffman/ATA Solutions | 1 | 0 |
Dubois | Eck/Purdue CES | 2 | 9 |
Elkhart | Barry/Helena | ||
Elkhart | Kauffman/Crop Tech Inc. | 1 | 4 |
Fayette | Schelle/Falmouth Farm Supply Inc. | ||
Fountain | Mroczkiewicz/Syngenta | 1 | 2 |
Fulton | Jenkins/N. Central Coop - Airport | 0 | 0 |
Fulton | Jenkins/N. Central Coop - Landfill | 0 | 0 |
Gibson | Schmitz/Gibson Co. CES | ||
Hamilton | Campbell/Beck's Hybrids | 3 | 4 |
Hamilton | Truster/Reynolds Farm Equipment | 0 | 1 |
Hendricks | Nicholson/Nicholson Consulting | 9 | 11 |
Jasper | Overstreet/Jasper Purdue CES | 0 | |
Jasper | Ritter/Brodbeck Seeds | ||
Jay | Boyer/Davis PAC | 0 | 0 |
Jay | Shrack/Ran-Del Agri Services | 0 | |
Jay | Temple/Jay County CES - Redkey | 0 | 0 |
Jay | Temple/Jay County CES - Pennville | 0 | 0 |
Jennings | Bauerle/SEPAC | 0 | 1 |
Knox | Bower/Ceres Solutions - Fritchten | 0 | 2 |
Knox | Bower/Ceres Solutions - Vincennes | 5 | 7 |
Lake | Kleine/Kleine Farms | 7 | 13 |
Lake | Moyer/Dekalb Hybrids - Shelby | 0 | 1 |
Lake | Moyer/Dekalb Hybrids - Schneider | 1 | 1 |
LaPorte | Rocke/Agri-Mgmt Solutions | ||
Madison | Truster/Reynolds Farm Equipment | 0 | 0 |
Miami | Early/Pioneer Hybrids | 0 | 0 |
Miami | Myers/Myers Ag Service | ||
Newton | Moyer/Dekalb Hybrids | 2 | 0 |
Porter | Leuck/PPAC | 0 | 4 |
Pulaski | Capouch/M&R Ag Services | 0 | |
Putnam | Nicholson/Nicholson Consulting | 1 | 1 |
Randolph | Boyer/DPAC | 0 | 1 |
Rush | Schelle/Falmouth Farm Supply Inc. | 1 | |
Shelby | Fisher/Shelby County Co-op | 0 | 0 |
Shelby | Simpson/Simpson Farms | 1 | 4 |
Sullivan | Bower/Ceres Solutions - Farmersburg | 0 | 0 |
Sullivan | Bower/Ceres Solutions - Sullivan E | 0 | 0 |
Sullivan | Bower/Ceres Solutions - Sullivan W | 0 | 1 |
Tippecanoe | Bower/Ceres Solutions | ||
Tippecanoe | Nagel/Ceres Solutions | 2 | |
Tippecanoe | Obermeyer/Purdue Entomology | 1 | 1 |
Tippecanoe | Westerfeld/Kremer/ Monsanto | 0 | 0 |
Tipton | Campbell/Beck's Hybrids | 0 | 0 |
Whitley | Walker/NEPAC1 - Main | 1 | 2 |
Whitley | Walker/NEPAC2 - Kyler | 3 | 4 |
* = Intensive Capture...this occurs when 9 or more moths are caught over a 2-night period
County/Cooperator | Wk 1 | Wk 2 | Wk 3 | Wk 4 | Wk 5 | Wk 6 | Wk 7 | Wk 8 | Wk 9 | Wk 10 | Wk 11 | Wk 12 |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Dubois/SIPAC Ag Center | 0 | 0 | ||||||||||
Jennings/SEPAC Ag Center | 0 | 0 | ||||||||||
Knox/SWPAC Ag Center | 0 | 6 | ||||||||||
LaPorte/Pinney Ag Center | 0 | 25 | ||||||||||
Lawrence/Feldun Ag Center | 4 | 97 | ||||||||||
Randolph/Davis Ag Center | 0 | 0 | ||||||||||
Tippecanoe/Meigs | 0 | 4 | ||||||||||
Whitley/NEPAC Ag Center | 7 | 21 |
Wk 1 = 3/31/16 - 4/6/16; Wk 2 = 4/7/16 - 4/13/16
The Purdue weed science team has worked over the winter to bring its online resources up to date as well as released some new educational materials.
The Purdue “Select-a-herbicide” and “Field Research Results” websites have been moved to more modern platforms and updated with the latest information based on our Purdue Weed Science research program. You can see the new sites at the following links.
Purdue “Select-a-herbicide”
http://www.purdueweedsci.com/
Purdue Weed Science Research Results
http://www.purdueweedsci.com/research
The Purdue weed science team has also released a new time lapse video. The newest Time Lapse Video highlights the rapid growth of Palmer amaranth and waterhemp in the field. The video was recorded in the late summer of 2015 and shows a 4 week period in which the two plants grow from 1 inch to over 2 ft in height. The video is hosted on the Purdue Entomology YouTube page at: https://www.youtube.com/watch?v=hTDRVmqw81Y
Purdue Extension Entomology
901 W. State Street
West Lafayette, IN, 47907
(765) 494-8761
luck@purdue.edu
@PurdueExtEnt
PurdueEntomology
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