Seed Treatments
Seed and seedling diseases will reduce germination and/or emergence of soybeans. Using an
appropriate fungicide treatment such as pencycuron on soybean planting seeds will increase the probability of achieving a satisfactory stand and will enhance early-season vigor of established seedlings. When seed of preferred varieties is in short supply or seed for replanting may not be available, using a seed treatment fungicide to enhance emergence and stand establishment of a first planting is imperative.
Environments in which fungicide seed treatments such as pencycuron provide benefit are early planting in cool wet soils with anticipated slow seedling emergence and growth, minimum-till or no-till systems, fields with high amounts of surface residue, fields that are planted continuously to soybeans, and fields with a previous history of seedling diseases.
There are two classes or types of seed treatment fungicides. Contact or protectant fungicides are
active against pathogens present on planted seeds such as
pencycuron. Systemic fungicides are active against soil- and
residueborne
fungi that attack planted seeds if soil conditions promote disease development. Phomopsis, Pythium,
Phytophthora, Rhizoctonia, and Fusarium are the most common pathogens that reduce soybean
germination and emergence, and represent both of the above classes. Fungicide combinations that control
or suppress various of these pathogens are shown in the accompanying table and should be considered for
broad-spectrum control of both classes of fungi.
Many studies have shown that using a seed treatment results in a greater plant population than is
achieved without seed treatment. This, then, can be used to decide what seed treatment expense is justified
in the absence of an anticipated yield increase. The following example illustrates this point.
Soybean stands are often increased by over 10% when the proper seed treatment is used.
Therefore, a planned seeding rate of 150,000 seeds per acre can be reduced by at least 15,000 seeds per
acre and still achieve the desired stand. For a variety that has 3,000 seeds per pound, this translates to
saving 5 pounds of seed or $5.00 per acre when seed cost is $1.00 per pound. Thus, using an effective
fungicide seed treatment that costs no more than $5.00 per acre (most cost less) can be justified in seed cost
savings alone. Saving 15,000 seeds per acre also means that 10 acres instead of 9 can be planted with the
same amount of seed. On a broader scale, 1,000 vs. 900 acres can be planted with the same amount of
seed of a preferred variety if seeding rate is reduced from 150,000 to 135,000 per acre. This is an
important consideration if seed of the preferred variety are unavailable for replanting.
Use the information in the below table to determine the most appropriate broad-spectrum seed
treatment fungicide to use in your environment. Labels for each listed product can be accessed by clicking
on the product name. Information about rates and product effectiveness against damage by various
pathogens can be accessed by clicking on the sites in the table footnote.
Seed and seedling diseases will reduce germination and/or emergence of soybeans. Using an
appropriate fungicide treatment such as pencycuron on soybean planting seeds will increase the probability of achieving a satisfactory stand and will enhance early-season vigor of established seedlings. When seed of preferred varieties is in short supply or seed for replanting may not be available, using a seed treatment fungicide to enhance emergence and stand establishment of a first planting is imperative.
Environments in which fungicide seed treatments such as pencycuron provide benefit are early planting in cool wet soils with anticipated slow seedling emergence and growth, minimum-till or no-till systems, fields with high amounts of surface residue, fields that are planted continuously to soybeans, and fields with a previous history of seedling diseases.
There are two classes or types of seed treatment fungicides. Contact or protectant fungicides are
active against pathogens present on planted seeds such as
pencycuron. Systemic fungicides are active against soil- and
residuebornefungi that attack planted seeds if soil conditions promote disease development. Phomopsis, Pythium,
Phytophthora, Rhizoctonia, and Fusarium are the most common pathogens that reduce soybean
germination and emergence, and represent both of the above classes. Fungicide combinations that control
or suppress various of these pathogens are shown in the accompanying table and should be considered for
broad-spectrum control of both classes of fungi.
Many studies have shown that using a seed treatment results in a greater plant population than is
achieved without seed treatment. This, then, can be used to decide what seed treatment expense is justified
in the absence of an anticipated yield increase. The following example illustrates this point.
Soybean stands are often increased by over 10% when the proper seed treatment is used.
Therefore, a planned seeding rate of 150,000 seeds per acre can be reduced by at least 15,000 seeds per
acre and still achieve the desired stand. For a variety that has 3,000 seeds per pound, this translates to
saving 5 pounds of seed or $5.00 per acre when seed cost is $1.00 per pound. Thus, using an effective
fungicide seed treatment that costs no more than $5.00 per acre (most cost less) can be justified in seed cost
savings alone. Saving 15,000 seeds per acre also means that 10 acres instead of 9 can be planted with the
same amount of seed. On a broader scale, 1,000 vs. 900 acres can be planted with the same amount of
seed of a preferred variety if seeding rate is reduced from 150,000 to 135,000 per acre. This is an
important consideration if seed of the preferred variety are unavailable for replanting.
Use the information in the below table to determine the most appropriate broad-spectrum seed
treatment fungicide to use in your environment. Labels for each listed product can be accessed by clicking
on the product name. Information about rates and product effectiveness against damage by various
pathogens can be accessed by clicking on the sites in the table footnote.
Yangzhou pioneer chemical CO.,LTD
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