Hot, dry weather encourages certain pests in field crops, in particular spider mites in soybean and occasionally corn. Spider mites are a sporadic problem that most often occurs in August, but infestations in July are possible with sustained periods of hot, dry weather like some parts of Ohio are experiencing. Crop scouts in areas that have not received rain recently should be on the lookout for this problem; spider mites are easy to miss in early stages and can build quickly.
Look for light-colored stippling damage which is easier to spot than the mites themselves. In areas with heavy stippling you can confirm the presence of mites by tapping vegetation over a black piece of construction paper. [Many sources will say to use white paper; but insider tip: they are actually easier to see against a dark background]. The mites will look like specks of dust that move.
Stippling is common in the lower canopy even in non-outbreak situations. When the stippling extends up into the middle canopy and is common, treatment is recommended. We do not recommend edge treatments for this particular pest. Make the decision for the whole field. Most pyrethroid products with the exception of bifenthrin are not effective against spider mites and may even flare them. Lorsban and generics have been popular choices against mites but may be less available now. Check the field five days after application for resurgence because these products do not kill mite eggs.
There are specific miticide products that are particularly effective because they also kill mite eggs, eliminating the next generation. Two such products are abamectin (Agri-Mek SC), labeled for use on soybeans, and etoxazole (Zeal), labeled for use on corn and soybeans.
A resurgence of moisture will go a long way to reducing spider mite populations. Mites are particularly susceptible to fungal insect/mite killing pathogens which are favored by moist conditions (one of the reasons dry weather encourages mite outbreaks).
As small grains are harvested across the state, here are some management considerations for double-crop soybean production:
Relative Maturity. Relative maturity (RM) has little effect on yield when soybeans are planted during the first three weeks of May. However, the effect of RM can be larger for late planting. When planting soybean late, the latest maturing variety that will reach physiological maturity before the first killing frost is recommended (Table 1). This is to allow the soybean plants to grow vegetatively as long as possible to produce nodes where pods can form before vegetative growth is slowed due to flowering and pod formation.
Table 1. Recommended relative maturity (RM) ranges for soybean varieties planted in June and July in northern, central, and southern Ohio. Continue reading →
Across the state, soybean growth and development is variable, ranging from early vegetative stages to flowering. However, there has been some confusion regarding the identification of the VC and V1 growth stages. This confusion is mostly due to two definitions of V1…that actually mean the same thing. The Fehr and Caviness Method (1977) is based on the number of nodes that have a fully developed leaf, whereas Pederson (2009) focuses more on leaf unrolling so that the leaf edges are no longer touching. The VC definition for both methods is the same, but the differences start to appear between the methods at V1. Continue reading →
While progress is way ahead of last year, soybean planting is spilling into June. (According to USDA NASS, 53% of soybean acreage was planted by May 24, 2020. Last year, at the same time, only 11% of soybean acreage was planted.) As planting continues into June, farmers may want to consider adjusting their cultural practices:
Row spacing. Soybean planted in narrow rows (7.5 or 15-inch row width) generally yields higher than soybean planted in wide rows (30-inch). The row spacing for June-planted soybeans should be 7.5 to 15 inches, if possible. Continue reading →
By: Laura Lindsey and Stephanie Karhoff, OSU Extension
Following wet weather conditions and fallow fields, some producers are wondering if they need to inoculate their soybean seed with Rhizobia.
Soybean plants have a symbiotic relationship with bacteria in which the bacteria fix nitrogen from the atmosphere into a plant-available form of nitrogen. In soybean, nitrogen fixation is associated with Bradyrhizobium japonicum (commonly referred to as just Rhizobia). Generally, fields with a history of soybean production have an adequate population density of Bradyrhizobium japonicum. In our research trials, we have measured a yield increase of approximately 1.5 to 2.0 bu/acre when soybean seed is inoculated and the field has a history of soybean production. Continue reading →
By: Todd Hubbs, Department of Agricultural and Consumer Economics University of Illinois. farmdoc daily(10):29
Soybean prices put in a moderate rally last week. An outlook for a large South American soybean crop and uncertainty of the impact on economic growth associated with the evolving coronavirus situation hang over U.S. soybean demand scenarios moving forward. Expanding soybean acreage in 2020 looks to test the prospects for lower ending stocks despite stronger Chinese buying. Continue reading →
By: Jason Hartschuh, OSU Extension Crawford County
Managing stored grain throughout the winter is an important part of your grain marketing plan for farm profitability. This winter we are already receiving reports of stored grain going out of condition, which can lower the value and be a hazard to those working around the grain facility. At a minimum, stored grain that has gone out of condition can cause health hazards, especially when grain dust contains mold and bacteria. Out of condition grain can also form a crust or stick to the bin walls and if someone enters the bin for any reason an entrapment could occur. For more information on safety when working around grain visit http://go.osu.edu/AFM and listen to episode 41 of the podcast on grain bin safety. Continue reading →
By: Todd Hubbs, Department of Agricultural and Consumer Economics .University of Illinois. Originally published by farmdoc daily(10):14
Soybean futures prices fell again last week on reports of a coronavirus outbreak rattling the Chinese economy and the prospects of a huge Brazilian crop. A double hit associated with increased production from our main competitor and a potential drop in Chinese demand appears set to drive prices lower in the near term. If present consumption trends stay in place this marketing year, the prospect of ending stocks dropping substantially below the current projection of 475 million bushels seem remote.
The coronavirus outbreak continues to spread around the world. The Chinese government’s attempt to contain the virus appears to have fallen short and brings up the possibility of a hit to China’s economic growth. While China’s growth and integration in world markets helped commodity prices, the risk-off approach to most equity markets under the prospect of reduced growth in China is hurting agricultural commodity prices. Soybeans are particularly impacted by this development. Continue reading →
By: Todd Hubbs, Department of Agricultural and Consumer Economics University of Illinois .December 9, 2019. farmdoc daily (9):230
The two major drivers of uncertainty impacting soybean prices in 2019 appear set to carry over into 2020. The status of trade negotiations with China continues to move soybean markets despite numerous fits and starts in the process. Another USDA estimate of the 2019 soybean crop comes out in January. Without supportive information on either issue, the sustainability of the recent price rally into 2020 seems remote.
Nearby soybean futures prices since the middle of September ranged between $8.70 and $9.40. The highest prices came in mid-October in association with a reduced soybean production level in the October WASDE report and thawing relations on the trade front. The lowest prices occurred in early December after another round of trade frictions. Soybean basis during the recent rally in central Illinois sits in a stronger position than during the October price jump. Soybean basis strengthened almost twenty cents in the region from October levels with cash prices at soybean processors showing particularly strong bids. Continue reading →
By: Laura Lindsey and Peter Thomison, OSU Extension
Ohio’s corn and soybean crops experienced exceptional growing conditions in 2019, including record rainfall in May and June followed by drier than normal August and September conditions in many areas. As a result of the early season saturated soils, corn and soybean planting was delayed across most of the state. For soybean, planting date is the most important cultural practice that influences grain yield. Planting date is also a major factor affecting crop performance and profitability in corn. The persistent rains and saturated soils caused localized ponding and flooding. These conditions resulted in root damage and N loss that led to uneven crop growth and development between and within fields. Agronomists often question the value of test plot data when adverse growing conditions severely limit yield potential. Continue reading →