What pesticides are used on alfalfa?
The products used in alfalfa that are most troublesome include the herbicide diuron (Karmex or Direx), Velpar, and the insecticide chlorpyrifos (Lorsban, Lock-On, Cobalt, Stallion). Diuron is used for winter weed control in alfalfa (primarily as a pre-emergence material) while chlorpyrifos is used for weevil control.
Is alfalfa sprayed with pesticides?
Yes, 93% of all the alfalfa planted by farmers in the U.S. is grown without the use of any herbicides. Unfortunately, the widespread adoption of the company’s GM seeds will lead to herbicide addiction by an entirely new segment of farmers who must spray Roundup® on their fields in order to grow GM alfalfa.
How do I get rid of weevils in alfalfa?
Two cultural practices can be used to reduce alfalfa weevil damage. Fall removal of alfalfa for hay or by grazing following freeze-down will reduce egg-laying sites. Early harvest in the spring can be used instead of an insecticide application.
How do you kill aphids in alfalfa?
Organically certified insecticides such as azadirachtin (Neemix), neem oil (Trilogy), and pyrethrin (PyGanic) are registered for use on alfalfa to control aphids. Studies conducted in California, however, have shown that at best they provide slight suppression of aphids but do not control them.
Can alfalfa weevils fly?
Insect Development Alfalfa weevils fly to alfalfa fields in the fall and remain there over the winter. They are active only when air temperatures climb above 48oF.
What is alfalfa sprayed with?
The most commonly used herbicides in seedling alfalfa are Raptor, Pursuit, 2,4-DB, and Buctril. These herbicides are used alone or in tank-mix combinations depending on the weed species present. The selective grass herbicides Select Max or Poast are often used if grassy weeds are present.
Does Hay get sprayed with pesticides?
Wheat, oats, barley and other grain fields, as well as hay fields, are often sprayed with herbicides to control broad-leaf weeds long-term.
Do you have to spray alfalfa?
Alfalfa weevil may be the first insect pest to appear in early spring. A common recommendation is to cut or spray when 40 percent of terminal buds show chewing damage.
What do alfalfa weevils turn into?
It is usually inactive during the hot summer months, entering a dormant state called aestivation. The alfalfa weevil larva is a small, light green worm with a wide, white stripe down the center of its back, paralleled by a lighter strip down each side. When fully grown, it will reach 3/8 inch (9 mm) in length.
What do you spray for alfalfa weevil?
Recommendations
| Insecticide | Rate per Acre | Harvest or Graze (days) |
|---|---|---|
| Ambush 2EC (permethrin) | 6.4 to 12.8 fl oz | more than 6.4 fl oz = 14 days |
| Dimethoate E267 | .75 to 1.5 pt | 10 |
| Baythroid 2 (cyfluthrin) | 1.6 to 2.8 fl oz | 7 |
| Furadan 4F (carbofuran) | 1/2 pt 1 pt 2 pt | 7 14 28 |
What does an alfalfa weevil look like?
The adult alfalfa weevil is a light brown snout beetle distinguished by a darker brown strip down the center of its back. It is typically about 3/16 inch (4.7 mm) in length. The beetle is found in alfalfa during the spring, early summer, and fall.
Why are pea aphid outbreaks a concern when treating for alfalfa weevil?
Aphids are considered primary pests of alfalfa if they reach action thresholds prior to hay cutting (Table 2). This is the most common way that pea aphids become a problem and occurs because the insecticides that produce effective alfalfa weevil control are also highly toxic to many species of beneficial insects.
What is the Soil sorption coefficient of malathion?
Soil Sorption Coefficient (K oc) 2,4: 30, 93-1800 depending on soil type and environmental conditions. Malathion is a broad-spectrum insecticide used to control a variety of outdoor insects in both agricultural and residential settings.
What kind of chemicals are used to kill alfalfa weevils?
When alfalfa weevil populations are extreme and beyond the economic threshold, chemical control will be necessary for effective control. Some chemicals that have proven to have an effect on the alfalfa weevil is Matador/Silencer, Dicis 5EC, Malathion 500, Malathoin 85E (only effective on larvae), Imidan, and Lagon.
How much chemigation can I use on alfalfa?
Minimum application volume (water) 10 GPA ground and 2 GPA aerial application. Chemigation and ULV applications are allowed by label. Maximum of 5.6 fl. oz./ acre (0.044 lb. a.i./acre) per cutting for alfalfa or 2.8 fl. oz./acre (0.022 lb. a.i./acre) per cutting on mixed-stands of alfalfa…
What is the chemical name of Malathion insecticide?
Chemical Class and Type: Malathion is an organophosphate insecticide. The Chemical Abstracts Service (CAS) registry number is 121-75-5 and the International Union of Pure and Applied Chemistry (IUPAC) name for malathion is O,O-dimethyl dithiophosphate of diethyl mercaptosuccinate. 1
