potato 5-9-12 CLEAN - Vegetableipmasia.org

ORGANIC POTATO PRODUCTION Table 15.10 Pesticides Labeled for Management of Spider Mites Class of Compounds Product Name (active ingredient) Product Rate PHI (days) REI (hours) Efficacy Comments M-­‐Pede (potassium salts of fatty acids) SULFUR Kumulus DF (sulfur) Micro Sulf (sulfur) Microthiol Disperss (sulfur) OTHER Sil-­‐Matrix (potassium silicate) 1-­‐2% volume to volume 0 12 1 Soap based products effective in 2/3 trials. 3-­‐10 lb/A 24 1 Elemental sulfur effective in 2/3 trials. Do not use within 2 weeks of oil applications. 5 lbs/A 24 1 Elemental sulfur effective in 2/3 trials. Does not provide immediate mortality. Foliage contact and coverage extremely important. 5-­‐10 lbs/A -­‐ 24 1 Elemental sulfur effective in 2/3 trials. 0.5-­‐1% solution 0 4 ? Apply 20 gallons finished spray/A. SucraShield (sucrose octanoate esters) 0.8-­‐1% vol to vol solution 0 48 ? Use between 25 and 400 gal of mix per acre. 59B PHI = pre-­‐harvest interval, REI = restricted entry interval. -­‐ = pre-­‐harvest interval isn't specified on label. Efficacy: 1-­‐ effective in half or more of recent university trials, 2-­‐ effective in less than half of recent university trials, 3-­‐not effective in any known trials, ?-­‐ not reviewed or no research available . 15.11 Slugs and SnailsTime of concern: Early spring and fallKey characteristics: See Rothamsted HUslug controlUH publication.(Reference 121)Relative risk: Sporadic but wet weather and poorly composted organic matter favor population increase.Management Option Slug biology Molluscicide use Scouting Site selection Crop rotation Resistant varieties Sanitation Recommendation for Slugs and Snails Slugs and snails are similar in biology except slugs lack an external spiral shell. Pest species have up to 2 generations per year and eggs are laid in the spring and/or fall. Eggs deposited in the fall overwinter and hatch the following spring, usually in April and May. Slugs and snails thrive under the humid canopy of potato crops and can cause significant damage to tubers. Holes and cavities created by feeding of these mollusks are sometimes similar in appearance to (and confused with) that caused by soil arthropods such as millipedes, cutworms and white grubs. For best results, apply in the evening by broadcasting or by row banding to moist soil or after heavy rains. Avoid placing molluscide baits in piles. Low-­‐lying areas and water-­‐filled wheel tracks are excellent places to monitor for the presence of these pests during the period just preceding tuber sizing. Slugs and snails are general organic matter feeders; weedy potato fields and heavy moist soils may favor build-­‐up of these pests. Potato crops following peas may be at greater risk of slug and snail attack in moist years compared to rotations following grains. Poorly drained soils, habitually wet areas of fields and weedy fields may be at greatest risk of infestation. No information on North American resistant varieties is available. Keeping land free of weeds may reduce the potential for infestation. 802012