Thirty-one of 38 sites reported this week. European corn borer (ECB)-E was caught at 7 sites and ECB-Z was caught at 15 sites. Corn earworm was caught at 16 sites with 8 sites high enough to be on a 4, 5, or 6 day spray schedule (see table below). Fall armyworm (FAW) was caught at 15 sites and Western bean cutworm (WBC) was caught at 24 sites.

According to the graph below which shows the average trap catches to date,  WBC, ECB-E and CEW continue to decline while FAW and ECB-Z are on the rise. Where FAW are being caught, a tassel emergence scout in late plantings is still a good idea, as some years we see heavy FAW infestations in the emerging tassels (see photos below) that may have time to get into developing ears before silk sprays for CEW.

 

Location	ECB-E	ECB-Z	CEW	FAW	WBC	DD to Date
Accord (Ulster Co.)	0	0	1	NA	1	1974.9
Amsterdam (Fulton Co.)	NA	NA	NA	NA	NA	1886.9
Athens (Greene Co.)	0	3	5	0	4	2114.8
Avon (Livingston Co.)	0	0	1	0	4	1872.2
Baldwinsville (Onondaga Co.)	1	0	7	5	6	1965.1
Batavia (Genesee Co.)	0	8	5	0	4	1940.3
Bellona (Yates Co.)	0	15	1	7	6	2008.3
Eagle Bridge (Washington Co.)	0	0	1	0	0	1731.0
Eden (Erie Co.)	0	0	0	2	0	1881.8
Farmington (Ontario Co.)	0	0	1	2	1	1860.7
Feura Bush (Albany Co.)	0	2	6	0	5	1900.9
Florida (Orange Co.)	0	1	18	9	8	2062.0
Geneva (Ontario Co.)	2	2	1	5	1	1937.2
Greenwich (Washington Co.)	5	6	0	0	0	1731.0
Hamlin (Monroe Co.)	NA	NA	NA	NA	NA	1830.3
Hurley (Ulster Co.)	24	33	0	0	0	2054.0
Kennedy (Chautauqua Co.)	0	2	0	2	2	1697.0
Kinderhook (Columbia Co.)	0	0	0	0	20	2044.0
King Ferry (Cayuga Co.)	0	0	3	4	4	1940.1
Kirkville (Madison Co.)	NA	NA	NA	NA	NA	1934.5
New Paltz (Ulster Co.)	NA	NA	NA	NA	NA	1975.1
Oswego (Oswego Co.)	0	0	0	12	1	1973.3
Owego (Tioga Co.)	0	0	0	0	1	1689.5
Pavilion (Genesee Co.)	0	2	0	91	6	1569.0
Penn Yan (Yates Co.)	0	7	2	10	4	1982.0
Peru (Clinton Co.)	2	0	0	0	43	1774.2
Plattsburgh (Clinton Co.)	0	0	0	0	73	1788.6
Plessis (Jefferson Co.)	0	1	0	1	16	1833.5
Preble (Cortland Co.)	NA	NA	NA	NA	NA	1878.3
Ransomville (Niagara Co.)	0	1	0	7	10	1997.3
Schaghticoke (Rensselear Co.)	NA	NA	NA	NA	NA	2071.0
Seneca Castle (Ontario Co.)	1	NA	0	7	0	1886.9
Sharon Springs (Schoharie Co.)	NA	NA	NA	NA	NA	1912.3
Sherwood (Cayuga Co.)	0	0	1	4	6	1940.1
South Colton (St. Lawrence Co.)	0	0	0	0	13	1537.0
Stone Ridge (Ulster Co.)	1	7	9	NA	NA	2054.0
Tivoli (Dutchess Co.)	0	1	1	NA	NA	2073.1
Williamson (Wayne Co.)	0	0	0	0	10	1771.3
ECB – European Corn Borer CEW – Corn Earworm FAW – Fall Armyworm WBC – Western Bean Cutworm NA – not available DD – Degree Day (base 50F) accumulation since May 1st according to nearest NEWA station
trap catches for the week of 8.7.18 – 8.14.18

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Dry Bean Western Bean Cutworm Alert
8.14.18
Marion Zuefle, NYS IPM Program
(Alert modified from Carol McNeil)
(Information and photos from T. Baute, OMAFRA)

This year we are monitoring ten WBC traps placed next to dry bean fields. The location of the traps are given in the image below. Dry bean growers should scout adjacent corn for WBC eggs and larvae when cumulative trap catch reaches 100 moths. Western bean cutworm (WBC) moths have reached this threshold at all but one site that we are monitoring. The threshold indicates that nearby corn should be scouted for egg masses and larvae.

Dry bean pod scouting should begin 7-10 days after peak emergence (given in blue below), in those fields which have accumulated over 100-150 moths/trap, near fields with high trap counts, or where WBC has been found in bean pods/seeds in recent years.

Dry Bean Location	7.10.18	7.17.18	7.24.18	7.31.18	8.7.18	8.14.18	Cumulative WBC
Attica (Wyoming Co.)	4	32	105	154	57	26	380
Avoca 1 (Steuben Co.)	0	2	37	233 (Avoca 1 + 2)	61	10	100+
Avoca 2(Steuben Co.)	2	30	101	see above	61	6	194+
Caledonia South (Livingston Co.)	0	6	30	59	35	13	143
Chili (Monroe Co.)	1	8	54	81	51	12	207
Geneva (Ontario Co.)	0	4	24	41	31	2	102
Groveland (Livingston Co.)	0	5	76	110	161	59	411
Riga (Monroe Co.)	5	54	146	71	121	41	438
Stafford (Genesee Co.)	0	8	83	80	70	16	258
Wayland (Steuben Co.)	2	3	11	9	10	1	36
Western Bean Cutworm trap counts by date NA – not available

WBC eggs, laid shortly after moth emergence, take 5-7 days to hatch. Pod feeding typically begins 10 days after peak moth catch. Early feeding by small larvae is generally minor and does not go into the pod. Growers in areas of concern should scout bean pin pods and larger pods for damage/feeding holes. Check 10 spots in a field, 5 plants per spot. WBC larvae hide in the soil during the day and won’t be seen on beans. If you find larvae in the pods during the day they are most likely European corn borer.

Spraying once, 7-10 days after peak emergence/catch, the ideal timing, resulted in almost no damaged pods in a Michigan trial.  Delaying a few days resulted in few damaged beans. A pyrethroid insecticide such as Warrior, Asana, Baythroid, etc. is recommended.  Organic growers using Pyganic may need more than one spray, and are advised to spray in the evening.

If you have questions contact Marion Zuefle at mez4@cornell.edu or 315-787-2379.

This project is funded by the NYS Dry Bean Industry.