Controlled‐Release Granules for the Delivery of Pymetrozine to Roots of Transplanted Rice Seedlings with Decreased Phytotoxicity and Enhanced Control Efficacy against Paddy Planthoppers

2021 ◽  
Author(s):  
Fengjiao Hao ◽  
Xiaohui Liu ◽  
Huizhu Yuan ◽  
Xiaojing Yan ◽  
Daibin Yang
Keyword(s):  
Controlled Release ◽  
Rice Seedlings ◽  
Control Efficacy ◽  
Transplanted Rice

Simulated controlled-release mesotrione for turfgrass tolerance and weed control

2021 ◽  
pp. 1-25
Author(s):  
Matthew J. R. Goddard ◽  
Clebson G. Gonçalves ◽  
Shawn D. Askew
Keyword(s):  
Controlled Release ◽  
Weed Control ◽  
White Clover ◽  
Tall Fescue ◽  
Standard Treatment ◽  
Creeping Bentgrass ◽  
Control Efficacy ◽  
Stepwise Change

Abstract Mesotrione typically requires multiple applications to control emerged weeds in turfgrass. Since it is absorbed by both foliage and roots, a controlled-release (CR) formulation could eliminate the need for multiple applications. Research was conducted evaluate simulated-release scenarios that mimic a potential CR mesotrione formulation. A soluble concentrate formulation of mesotrione was titrated to produce a stepwise change in mesotrione rates, which were applied daily to mimic predetermined release scenarios over a three-wk period. CR scenarios were compared to a broadcast treatment of mesotrione at 280 g ai ha-1 applied twice at three-wk intervals, and a nontreated. Mesotrione applied in three temporal release scenarios controlled creeping bentgrass, goosegrass, nimblewill, smooth crabgrass, and white clover equivalent to the standard sprayed mesotrione treatment in every comparison. However, each CR scenario injured tall fescue 2 to 7 times more than the standard treatment. Soil- and foliar-initiated repeat treatments were equivalent in most comparisons. Data indicates that mesotrione applied in a temporal range to simulate controlled release scenarios can deliver desired weed control efficacy comparable to sequential broadcast applications. More research is needed to elucidate proper timings and release scenarios to minimize turfgrass injury.

scholarly journals Decaying Utricularia-biomass versus soil-based substrate for production of high quality pre-transplanted rice seedlings using floating seedbeds

2018 ◽  
Vol 12 (12) ◽  
pp. 1983-1988
Author(s):  
Fitri Ramadhani ◽  
◽  
Benyamin Lakitan ◽  
Mery Hasmeda ◽  
◽  
...  
Keyword(s):  
Rice Seedlings ◽  
High Quality ◽  
Transplanted Rice

Some Factors Affecting Herbicide Selectivity in Upland Rice

Weed Science ◽  
1976 ◽  
Vol 24 (1) ◽  
pp. 63-67 ◽  
Author(s):  
D. Nangju ◽  
D. L. Plucknett ◽  
S. R. Obien
Keyword(s):  
Activated Carbon ◽  
Upland Rice ◽  
Rice Seed ◽  
Soil Leaching ◽  
Rice Seedlings ◽  
Factors Affecting ◽  
Degree Of Protection ◽  
Flooded Rice ◽  
Transplanted Rice ◽  
Direct Seeded

Several methods were used to overcome herbicide phytotoxicity to upland rice (Oryza sativaL., ‘IR8′). Seed pelleting with activated carbon and band application of activated carbon slurry over the rice seed were ineffective in reducing the toxicity of chloramben (3-amino-2,5-dichlorobenzoic acid) and atrazine [2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine] to upland rice. In contrast, a 2.5-cm layer of activated carbon and vermiculite mixture (1:1) placed over the rice seed was effective in overcoming the toxicity of these herbicides. Deep sowing (3.0 to 4.5 cm) of rice seed was adequate in protecting upland rice from herbicides which are toxic to direct seeded, flooded rice but are not toxic to transplanted rice. The degree of protection from deep sowing, however, was determined by site of uptake, herbicide adsorption by soil, leaching, and inherent toxicity of the herbicides to rice seedlings.

Phenoxy Acid Herbicides for Barnyardgrass Control in Transplanted Rice

Weed Science ◽  
1971 ◽  
Vol 19 (3) ◽  
pp. 203-206 ◽  
Author(s):  
S. K. De Datta ◽  
R. Q. Lacsina ◽  
D. E. Seaman
Keyword(s):  
Acetic Acid ◽  
Rice Seedlings ◽  
Japonica Variety ◽  
Transplanted Rice ◽  
Phenoxy Acid Herbicides ◽  
Delayed Flowering ◽  
Annual Weeds ◽  
Dichlorophenoxy Acetic Acid ◽  
Acid Herbicides ◽  
Derivatives Of

In experiments conducted at the International Rice Research Institute, Philippines, all commonly marketed formulations and derivatives of either [(4-chloro-o-tolyl)oxy]acetic acid (MCPA) or (2,4-dichlorophenoxy) acetic acid (2,4,D) performed in about the same way and were equally safe for use in controlling barnyardgrass [Echinochloa crusgalli (L.) Beauv.] and other annual weeds in transplanted rice (Oryza sativa L.). Eleven-day-old rice seedlings were more susceptible to amine salts of 2,4-D or MCPA than 21-day-old seedlings. Granular formulations of some chemicals were relatively less toxic than liquid formulations. The toxic effect of spraying the potassium salt of MCPA was less prolonged on the indica variety, IR22, than it was on the japonica variety, Chianung 242, which had delayed flowering and maturity.

scholarly journals Studies on the Settling of Transplanted Rice Seedlings.

1958 ◽  
Vol 26 (3) ◽  
pp. 199-202
Author(s):  
Tetsuya HIRANO ◽  
Shuichi ONODERA ◽  
Takeo TAKEMURA
Keyword(s):  
Rice Seedlings ◽  
Transplanted Rice
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