Trap Catches Identified to July 14
Greetings!
Welcome to the Aphid Alert update for the week ending July 14. Eighteen sites are now reporting (one had a technical issue this week).
This looks like it could be turning into an aphid year. The PVY Vector Risk Index is low, but rising in many locations. Several traps had high catches this week and we're seeing a lot of diversity in the species being captured. In some locations, this week's map is starting to look like last year's total PVY Risk Index map, and we generally get heavier flights starting the end of July.
Six sites this week had trap catches containing more than 20 vectors of varying efficiencies: Humboldt (35), Ada (41), Crookston (49), Sabin (25), and Brooks (39) in MN and Hoople (26) in ND. However, Green peach aphid (the most efficient vector) was recovered from traps in Perham, Crookston, Sabin, and Brooks. The presence of Green peach this year indicates we must have had a successful immigration flight in spring or early summer.
This summer we're also seeing the return of our newest identified PVY vector, soybean aphid. If you are growing soybeans this year, you may want to scout them for aphid.
Speaking of scouting, this is definitely a year for doing so. If you haven't started, you should. The increasing vector numbers also remind us that the use of crop oils (e.g. Aphoil, JMS Stylet Oil, etc) have been shown to significantly limit the transmission of PVY. A tactic to definitely consider this year...
Remember, Keep Scouting!
This looks like it could be turning into an aphid year. The PVY Vector Risk Index is low, but rising in many locations. Several traps had high catches this week and we're seeing a lot of diversity in the species being captured. In some locations, this week's map is starting to look like last year's total PVY Risk Index map, and we generally get heavier flights starting the end of July.
Six sites this week had trap catches containing more than 20 vectors of varying efficiencies: Humboldt (35), Ada (41), Crookston (49), Sabin (25), and Brooks (39) in MN and Hoople (26) in ND. However, Green peach aphid (the most efficient vector) was recovered from traps in Perham, Crookston, Sabin, and Brooks. The presence of Green peach this year indicates we must have had a successful immigration flight in spring or early summer.
This summer we're also seeing the return of our newest identified PVY vector, soybean aphid. If you are growing soybeans this year, you may want to scout them for aphid.
Speaking of scouting, this is definitely a year for doing so. If you haven't started, you should. The increasing vector numbers also remind us that the use of crop oils (e.g. Aphoil, JMS Stylet Oil, etc) have been shown to significantly limit the transmission of PVY. A tactic to definitely consider this year...
Remember, Keep Scouting!
Click on any figure to see full size version.
Cumulative PVY Vector Risk Index to Date
2016 PVY Vector Risk Total for Comparison
Weekly Catch by Location
Cumulative Species Catch to Date by Location
