MF743 Soybean Insect Management 2019 - …

1 How to Use This Guide 2019. Perennial Winter/Spring Summer Fall/Winter This publication was prepared to help Bean Leaf Beetle Pg. 2. producers manage Insect populations with Dectes Stem Borer Pg. 3. the best available methods proven practi . cal under Kansas conditions. It is revised Pillbugs Pg. 4. annually and intended for use during the Stink Bugs Pg. 4. current calendar year. The user should Thistle Caterpillars Pg. 9. know that pesticide label directions and Occasional Winter/Spring Summer Fall/Winter restrictions are subject to change, and Soybean Aphid Pg. 1. some may have changed since the date of Blister Beetles Pg. 2. publication.

2 The economics of control should be Grasshopper Pg. 4. con sidered in any pest Management Spider Mites Pg. 4. decision. Because costs vary greatly over Woollybear Caterpillars Pg. 9. time and are influenced by factors beyond Soybean Podworm Pg .4. the scope of this publication, specific Garden Webworm Pg. 9. insecticide products were not included or Green Clover Worm Pg. 8. omitting based on that criteria. Always compare product price, safety, and avail Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec ability when making treatment decisions. The user is responsible for proper usage. Bend about row feet of plants from soybeans are planted in no-till situations.

3 Read label directions carefully before adjacent rows over the cloth, and shake Some planter box seed treatments making a pesticide application. Remember, vigorously for a few seconds. Count the con taining permethrin (Kernel Guard it is illegal to use a pesticide in a manner insects that fall on the cloth. Repeat this Supreme or KickStart VP) are labeled inconsistent with the label. operation in at least 10 locations per field, for control ling these pests in soybeans. In Crop-specific directories with informa . and average the results. Use of a slick-sid addition, the seed treatments thiameth . tion for identification and Management of ed material will help keep the insects from oxam (Cruiser 5FS or CruiserMAXX).

4 Pests described in this publication can be crawling away before they are counted. and imidacloprid (numerous products) are found at To survey narrow-row or drilled soy labeled for protecting soybeans against the Insect -information/crop-pests. beans for insects use the Texas Vertical seed corn maggot. Follow label directions A new tool that uses this information Beat Sheet. This device is made of a piece and DO NOT use leftover seed for food, enables you to build customized manage . of galvanized metal flashing or similarly oil, or livestock feed. ment guides for selected pests. To learn stiff material, 36 inches wide, 32 inches tall how to use this feature, see Aphids and crimped on the bottom to form a col.

5 Pests. Kansas State University entomol . lecting trough 4 inches wide. Place it next Soybean Aphid ogists assume no responsibility for product to the row and shake plants against the The Soybean aphid, Aphis glycines, has performance, personal injury, property vertical surface. Dislodged arthropods slide been present in eastern Kansas since 2002. dam age, or other types of loss resulting into the trough where they can be counted Relatively cool summer weather and large from the handling or use of the pesticides or poured into a container to be counted migrations from northern states may have listed. elsewhere. contributed to the abundance of Soybean Sampling Techniques aphids present in 2004 and 2008.

6 Tem . Surveying for Soybean insects attacking Seed-Attacking Insects peratures around 80 F are optimal for aboveground plant parts is not difficult Seedcorn Beetle, Seedcorn Maggot Soybean aphids, while significantly higher if beans are planted in rows. On plants These are soil-infesting insects that temperatures impede population growth. less than a foot high, Insect densities can attack seeds. Damage is heaviest in cool, The Soybean aphid is a small, yellowish be established by kneeling along the row, wet springs when emergence is delayed. or lime -green aphid with black cornicles. turning over leaves and looking for insects. Recent problems in Kansas seem to be During vegetative growth look for aphids On larger plants a shake cloth technique most serious where heavy rates of liquid or under young upper leaves, petioles, and is generally recommended.

7 Place a 3-foot solid livestock manure have been spread stems. Larger colonies are tended by ants, square cloth between the Soybean rows. on the field just before planting or where which are easier to spot against green Soybean leaves. When soybeans are in aphids alone does not warrant the use reproductive stages, look for aphids in of seed treatments, but their use may be mid-canopy leaves and on stems. Other justified in late-planted or double-cropped aphid species occasionally land in Soybean , soybeans in northeast Kansas in years with but do not develop large colonies. high Soybean aphid populations. Growers in north central and east If significant aphid populations are ob.

8 Ern Kansas should watch for this pest served on soybeans in Kansas, contact your Bean leaf beetle feeding damage but resist the temptation to treat until local extension office or email mccornac@ the growing point, or populations of seven populations exceed the threshold of 250 so the infestation can be tracked beetles per row-foot on soybeans with four aphids per plant from the vegetative stage and studied. Learn more about manage or fewer nodes and 25 percent defolia tion. through early pod fill. This threshold in ment of Soybean aphids at Most years, 50 or more beetles per corporates an approxi mate 7-day lead-time pests/ Soybean -aphid. row-foot are required to reduce yields in between scouting and treatment to allow late season.

9 Treatments may be justified if for spray arrangements or weather delays. Beetles significant pod-feeding occurs while pods A sampling plan is available at myfields. Bean Leaf Beetle are still developing. This Insect is known info/method/ Soybean -aphid for registered The bean leaf beetle is red to light tan, to transmit bean pod mottle virus disease. users. This tool provides a treatment 1/4-inch long, and found in all parts of the Research is ongoing to determine if reduc . decision based on the number of infested state. The upper back is marked by six ing the treatment threshold would reduce plants sampled above a tally threshold. black spots near the midline bor dered by a the chance of plants being affected by this Soybeans in early reproductive stages narrow black band.

10 Insects react to nearby disease. Several seed treatments are labeled appear most suscep tible to yield loss that disturbances by dropping to the ground. for early season protection against bean takes the form of reduced pod numbers. Typically, bean leaf beetles chew oval leaf beetle. A seed treatment is not justi . Aphid populations on maturing plants are holes in the foliage, causing damage of fied solely for control of bean leaf beetle typically in decline and producing winged little economic consequence. Border unless there have been recurring problems. forms that will leave the field. Treating rows of emerging soybeans may support See Bean Leaf Beetle, MF2824 to learn these fields generally is not justified.