Topical Applications of DSMA and MSMA in Irrigated Cotton

Abstract

Single topical applications of monosodium methanearsonate (MSMA) affected cotton (Gossypium hirsutumL.) growth more than did similar disodium methanearsonate (DSMA) applications. There was usually no difference in yield among rates and dates with single applications of DSMA. Single applications of MSMA at later dates and higher rates reduced yields. Repeated topical applications of MSMA reduced yields and affected boll weight, lint percentage, number of seed per boll, and fiber fineness as compared with these properties of cotton treated once with MSMA. Response of cotton to MSMA was related to the number of applications and rate of herbicide. Repeated applications of DSMA affected cotton yield, lint percentage, and number of seed per boll less than did MSMA.

The Influence of Fluometuron and MSMA on Cotton Yield and Fruiting Characteristics

“…However, addition of fluometuron antagonizes activity of these herbicides (8). Early research with topical applications of MSMA indicated that repeated applications affected cotton more than a single application and that applications late in the growing season affected cotton more than early applications (1,2). Baker et al (3) reported that a single application of MSMA over the top of 10-cm cotton was valuable when weed infestations were severe enough to reduce cotton yield.…”

Effectiveness of Ammonium Thiosulfate to Enhance Weed Control and Reduce Cotton (Gossypium hirsutum) Injury1

“…MSMA injury symptoms from topical applications are first seen on the leaves, petioles, and stems. Leaves initially become dark blue-green and higher rates may eventually cause foliage burning and necrosis (Arle and Hamilton 1971;Snipes and Byrd 1994). Petioles and stems redden while temporary stunting may occur (Arle and Hamilton 1971).…”

“…Leaves initially become dark blue-green and higher rates may eventually cause foliage burning and necrosis (Arle and Hamilton 1971;Snipes and Byrd 1994). Petioles and stems redden while temporary stunting may occur (Arle and Hamilton 1971). Unstressed cotton generally can overcome the discoloration, foliage burn, and stunting 0 5 15 7 7 5 5 6 6 9 8 20 12 9 14 11 5 8 6 1 6 12 9 34 Totals 39 54 59 68 under favorable conditions.…”

“…Unstressed cotton generally can overcome the discoloration, foliage burn, and stunting 0 5 15 7 7 5 5 6 6 9 8 20 12 9 14 11 5 8 6 1 6 12 9 34 Totals 39 54 59 68 under favorable conditions. MSMA applied over the top during squaring can delay the process of fruiting and maturity (Arle and Hamilton 1971). Several studies have shown that seed cotton yield can be reduced when MSMA is applied topically to cotton in later growth stages (Arle and Hamilton 1971;Arle and Hamilton 1976;Baker et al 1968;Shankle et al 1996;Snipes and Byrd 1994).…”

“…MSMA applied over the top during squaring can delay the process of fruiting and maturity (Arle and Hamilton 1971). Several studies have shown that seed cotton yield can be reduced when MSMA is applied topically to cotton in later growth stages (Arle and Hamilton 1971;Arle and Hamilton 1976;Baker et al 1968;Shankle et al 1996;Snipes and Byrd 1994). Seed cotton yields were slightly reduced when MSMA was applied over the top of 5.1-to 10.2-cm cotton, whereas applications at later stages reduced yields severely (Baker et al 1968).…”