Rawhide Chemoil

Here is the latest updates from the Rawhide Agronomy Department.

*Soybean Cyst Nematodes

*Stalk Rot in Corn

*Grain Bin Treatments

Soybean Cyst Nematode

There has been a lot of talk about SCN. Very few growers in eastern Nebraska seem to concerned about this pest at this time. We have found it in our area and we need to manage it while it is concentrated in small areas.

Here are some locations where we have found SCN. North east of North Bend, east and west of Fremont on hwy 30, Valley area and many areas south of Valley to the Platte River. Please call us to look at your soybean fields and/or take some samples. This pest can be managed with crop rotation and cyst resistant soybean varieties. Yield damage in fields we have identified have ranged from 5 to 20 bushels in yield loss. Call us, we want to increase your yields.

Stalk Rots in Corn

Wet weather this spring and stress late in the season has given us a very good environment to diseases. The 3 main diseases in the Dodge, Saunders, and Washington Counties are Fusarium, Gibberella and Anthracnose. We suggest checking your fields for these diseases. Give the stalks push and evaluate standability. There may be some fields that need to be taken out soon. Below are some pictures and descriptions of the stalk rots we have mentioned.

Disease Name: Anthracnose Stalk Rot

Pathogen: Fungus. Colletotrichum graminicola

Symptoms: Water-soaked areas on the surface of the lower internodes, developing brownish linear streaks, turning black later in the season, larger oval black areas may develop, disintegrated gray to dark brown pith, severely infected stalks likely to lodge.

Conditions: Favored by cool to warm, wet, humid weather, minimum tillage, continuous corn, stresses that result in early senescence.

Inoculum Survival: Infected crop residue (leaves, leaf sheaths and stalks), infected seed (rare).

Inoculum Dispersal: Airborne spores. Unlike other stalk rots, infection occurs aboveground.

Management: Resistant hybrids (full season hybrids tend to have more resistance than short season), two year crop rotation with nongrass crops, cleanly plow under infected residue, balanced soil fertility.

Stalk Rots in Corn

Disease Name

Disease Name

Disease Name:

Keep on eye out for Stalk Rots. Pinch stalks for early detection and harvest fields with stalk rots early. Prevent lodging problems!

Grain Bin Treatments

Now is the time to treat your bins for insects. The best time is to treat before grain is put in the bins.

Empty Grain Bin Cleanup Products Malathion 57 EC

   Apply 1 gal in 25 gallons of water to cover 12,500 sq. ft.

   Apply to the point of run-off area around bin for approximately 6 feet out.

Tempo    Tempo 2E- Use .3 to .5 oz/1000 sq. ft. in 1 to 2 gallons of water.    Tempo 20 WP - One 9.5 gram packets in 1 gallon of water covers 1,000 sq. ft.   Use 2 packets (double rate) for longer residual.

Fusarium Stalk Rot

Pathogen: Fungus. Fusarium moniliforme

Symptoms: Disintegrated pith tissues.

Conditions: Warm, moist weather shortly after pollination. More prevalent when plants are subjected to stresses (such as dry weather) that result in early senescence and a reduction of sugar to roots and stalks.

Inoculum Survival: Infected crop residue (seed, stalks), soil.

Inoculum Dispersal: Soilborne hyphal fragments and spores. Infection occurs through roots.

Management: Resistant hybrids. Full season hybrids tend to have more resistance than short season. Balanced soil fertility. Do not exceed recommended plant populations.: Gibberella Stalk Rot

Pathogen: Fungus. Gibberella zeae

Symptoms: Stalks that are split open have a disintegrated pith with pink discoloration.

Conditions: Warm, moist weather in late summer (2-3 wks after silking). More prevalent when plants are subjected to stresses that result in early senescence and a reduction of sugar to roots and stalks.

Inoculum Survival: Infected crop residue (seed,stalks), seed, soil.

Inoculum Dispersal: Soilborne hyphal fragments and spores. Infection occurs through roots.

Management: Resistant hybrids. Full season hybrids tend to have more resistance than short season. Balanced soil fertility. Do not exceed recommended plant populations.: Diplodia Stalk Rot

Pathogen: Fungus. Diplodia maydis

Symptoms: Leaves turn grayish-green and eventually brown. Dark brown lesions extend in either direction from the node. Pith is disintegrated and discolored, stalks break easily. Tiny black bumps (pycnidia) may form just beneath the epidermis on lower internodes.

Conditions: Warm, moist weather in late summer (2-3 wks after silking), stresses that result in early senescence.

Inoculum Survival: Infected crop residue (seed, cobs, ear shanks, stalks),seed, soil.

Inoculum Dispersal: Soilborne hyphal fragments and spores. Infection occurs through roots.

Management: Resistant hybrids (full season hybrids tend to have more resistance than short season hybrids), balanced soil fertility, recommended plant population.