94 articles tagged "Insect and Mite Management".

After a brief lull in pheromone trap catches, we have resumed catching earworm moths all around the state. Although most of the counts are relatively low (less than 10 per night), remember that for early planted sweet corn that silks before the neighboring field corn silks, the threshold for treatment is 1 moth per night. So, if you have sweet corn that is in the vulnerable stage, green silks present, treatment is justified if you are catching any earworm moths in your trap.


​​A field day will be held on July 9 to share with the public the various research activities at the Southwest Purdue Agricultural Center in Vincennes, IN. The day will start at 7:30 A.M. with a health fair. Registration starts at 8:30 A.M. Presentation topics include: managing cucumber beetles while protecting bees, production of vegetables in high tunnels, canola production, hybrid cottonwood as a bioenergy crop, grape production, field crops disease update, soybean production, maximizing seed corn investment and benefits of starter fertilizer. Lunch is free with registration. A PARP class will be offered after lunch. Please contact Barb Joyner at 812-886-0198 or joynerb@purdue.edu to RSVP or go on-line at http:///tinyurl.com/2015SWPAC.


​On May 29, 2015, the EPA issued a proposal to protect bees from acutely toxic pesticides. As stated in the announcement, “EPA is proposing to prohibit the application of pesticides that are highly toxic to bees when crops are in bloom and bees are under contract for pollination services. These restrictions would prohibit application of most insecticides and some herbicides during bloom.” The criteria used to determine which products would be prohibited from use during bloom were 1) Liquid or dust formulation as applied; 2) Foliar use (applying pesticides directly to crop leaves) directions for use on crop; and 3) Active ingredients that have been determined via testing to have high toxicity for bees (less than 11 micrograms per bee). To see the details of the proposal including the list of active ingredients that would be affected by this proposal, go to www.epa.gov/oppfead1/cb/csb_page/updates/2015/protect-bees.html.  These proposed changes have the potential to[Read More…]


​So far it appears that populations of striped cucumber beetles appear to be low to moderate in most areas. The often cool and/or wet weather may be suppressing their activity currently, so be prepared if we get a period of warm, dry weather. Remember that cantaloupes and cucumbers are most susceptible to bacterial wilt, so the threshold for treatment is relatively low, 1 beetle/plant. For watermelons, pumpkins, and most squashes, the threshold is 5 beetles/plant because those cucurbits are less susceptible to bacterial wilt. When treating cucurbits that are in bloom for beetles, growers should wait to begin spraying until the flowers have closed up for the day. Ideally, sprays should be applied late in the evening if possible, because the potential for bee kills are reduced and that will allow for maximum residue levels on the foliage the next day.


​2015 marks the 40th year of my career as an entomologist and I still am surprised on a regular basis by how insects behave. I put out a corn earworm pheromone trap on May 14 and immediately caught 7 moths that night. Over the next three nights, I caught 36 moths. Typically, the few earworms that we would expect to overwinter here in west central Indiana would emerge about June 20. It has not been an unusually warm spring, to say the least, so it is unlikely that those moths emerged locally. The other possibility is migration from southern areas. Earworm moths often migrate in on storm fronts from the south. However, when moths are blown hundreds of miles on storm fronts, their wings usually get a little tattered. The moths I’ve been catching look pristine, as if they just emerged. So, the bottom line is that I have no[Read More…]


​Striped cucumber beetles are emerging from their overwintering habitat in southern Indiana. This pest can damage cucurbit crops in several ways. One that I saw this week is that they can kill young transplants by their direct feeding. Of more critical concern usually is their ability to transmit the bacterium that causes bacterial wilt of cucurbits. Cantaloupes and cucumbers are especially susceptible to this disease. Pumpkins and some of the winter squashes are susceptible when the plants are young. Other squash and watermelons are not affected by the disease. Therefore, based on years of research and experience, we have set the treatment threshold at 1 beetle per plant for cantaloupes, cucumbers, and very young pumpkins and winter squash (less than 3 weeks old). For watermelons, summer squashes, and older pumpkins and winter squashes, the threshold is 5 beetles per plant.  Our research has shown that for cucurbits grown in the[Read More…]


​It’s early in the growing season, but I am already receiving calls about aphids on melons. We had lots of problems with aphids in 2013 and not very many last year. Particularly at this time of year, I’m recommending Assail® for aphid control on melons for several reasons. First, it does an excellent job killing aphids. Second, it will also provide very good control of striped cucumber beetles when they become active in your field. Third, I’ve never been a big fan of pyrethroid insecticides for control of aphids. They work to some extent but we have other products that are better. Finally, the active ingredient in Assail®, acetamiprid, is much less toxic to honey bees than the other neonicotinoid insecticides that could be used for aphid control. If you used either Admire Pro® or Platinum® at planting time, you should receive 3-4 weeks of aphid control. Growers should be[Read More…]


​I have received calls about seedcorn maggots in melons and have seen wireworm damage in my research plots in Vincennes. Seedcorn maggots are usually associated with cool weather since the adult flies will not lay their eggs near melons plants when the soil temperature exceeds 70°F. So the cool weather we have had this past week could promote seedcorn maggot problems. One of the species of wireworms I observed is Conoderus lividus, a species commonly associated with corn. If you are planting melons after corn, the field could be infested with wireworms, although frankly this is fairly rare. You can determine the potential for wireworm problems prior to planting by burying a cup of flour or untreated grain (corn or wheat) about 6 inches under the ground. Come back and dig up the bait in about a week and look for wireworms. About the only product melon growers have available[Read More…]


​A field day will be held on July 9 to share with the public the various research activities at the Southwest Purdue Agricultural Center in Vincennes, IN. The day will start at 7:30 A.M. with a health fair. Registration starts at 8:30 A.M. Presentation topics include: managing cucumber beetles while protecting bees, production of vegetables in high tunnels, canola production, hybrid cottonwood as a bioenergy crop, grape production, field crops disease update, soybean production, maximizing seed corn investment and benefits of starter fertilizer. Lunch is free with registration. A PARP class will be offered after lunch. Please contact Barb Joyner at 812-886-0198 or joynerb@purdue.edu to RSVP or go on-line at http:///tinyurl.com/2015SWPAC.


​For most insect pests, we have some viable options to manage them organically. For years we have been looking for an organic solution for striped cucumber beetle and bacterial wilt on melons and cucumbers. It appears that we now have a viable option. There is a relatively new product, Cidetrak D, manufactured by Trece, which is sold as a gustatory stimulant. The active ingredient is buffalo gourd root powder, which contains a high percentage of cucurbitacin, which causes cucumber beetle to compulsively feed once they have tasted it. Years ago, there was a product available called SLAM, which contained buffalo root gourd and carbaryl, which we tested extensively and found to be quite effective. There were difficulties in applications, so the product never really took off with growers. More recently, my colleague in Kentucky, Dr. Ric Bessin, has tested Cidetrak D in conjunction with Entrust, which contains the active ingredient[Read More…]


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