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FAQs

Cooperative Extension works to improve lives, communities and the economy by serving as a statewide network of knowledgeable faculty and staff. The FAQs are submitted via email, website, social media and phone calls to the University of Arizona Cooperative Extension and answered by our team(s) of experts in their particular area.

Unable to find an answer to your question? Let us know.

4-H

  • How do I join 4-H?
  • What is 4-H?
  • Where can I find information on the James 4-H Camp?

About Cooperative Extension

  • Where can I find job opportunities with UArizona Cooperative Extension?
  • What is Cooperative Extension?

Animal Health

  • Are the Arizona walnut trees (Juglans Major) in Yavapai county toxic in any form or stage of growth to livestock, particularly to sheep?

Beef Cattle

  • Are the Arizona walnut trees (Juglans Major) in Yavapai county toxic in any form or stage of growth to livestock, particularly to sheep?

Crops / Soils

  • Can I mix orchard grass with rye grass in my horse pasture?
  • Does the Pima County Cooperative Extension office sell soil probes?
  • Who is in charge of plant/pest quarantine rules?
  • What is the optimum planting date for alfalfa?
  • Which alfalfa variety should I plant in the low desert of Arizona?
  • What is the optimum seeding rate for alfalfa?
  • When is the best time to apply pre-emergent for weeds?
  • Do pine needles make the soil acidic for mulch?
  • Can alfalfa be planted in the spring?
  • Is there a cover crop to reduce Texas root rot?
  • Where can I get my soil tested?
  • What is the best time of year to apply pre-emergent herbicides in Maricopa County area?

Farm Food Safety

  • Why is my nectarine tree not producing fruit?

Food Preservation

  • How can I determine if a jar of canned food is sealed?
  • What causes jars to break in a canner?
  • How long will canned food keep?
  • What causes lids not to seal?
  • Where can I get my pressure cooker gauge and seal tested if I live in Maricopa County?
  • Why is headspace important in canning?
  • Where can I get my pressure cooker gauge and seal tested if I live in Pima County?
  • I have questions about water bath canning
  • Is it ok to can orange and grapefruit juice?
  • If canned foods have been frozen during storage, are they safe to eat?

Fruits and Nuts

  • How do I prune my citrus trees?
  • How do I fertilize my citrus trees?
  • Who is in charge of plant/pest quarantine rules?
  • How can I treat Sooty Canker on a grapefruit tree?
  • Why is the fruit on our tangerine tree dry and pithy?
  • Where can I find fertilizer recommendations for grapefruit trees?
  • When should I plant fruit trees in Prescott Arizona Area?
  • Can I grow raspberries successfully in Catalina?
  • What variety of apple trees would you recommend to plant at about a 6000 foot elevation?
  • What are the chill hours in Arizona?
  • Where can I get publications about growing and caring for fruit trees?
  • What are the chill hours in Yavapai County?

Home Gardening

  • What is oleander gall?
  • How do I prune my citrus trees?
  • Can peonies be grown in Yuma?
  • What is wrong with my oleander plant?
  • Do you have information on how to care for roses in the low desert?
  • How well do daylilies grow in Green Valley?
  • There's a white fuzz on my cactus. What is it?
  • How do I care for Tulips in Arizona?
  • My roses and bougainvillea have round holes cut in the leaves? What caused it?
  • Why are my tomatoes not ripening?
  • How big should I dig my planting hole?
  • My plant's leaves have brown edges. What is the problem?
  • What causes vertical cracks on a saguaro cactus?
  • Is there a cover crop to reduce Texas root rot?
  • Is it ok to use aloe plants' flesh if it has mites?
  • What are the planting dates for Yuma?
  • I have a gardening question and I live in Maricopa County
  • Where can I find information about how to construct and maintain raised gardening beds?
  • I have a gardening question and I live in Cochise County
  • When planting trees and shrubs do you need to score the root ball to disturb the surface and cut circling roots?
  • What are the chill hours in Arizona?
  • What can I use as a natural weed/grass killer?
  • Recommendations for fertilizing sod
  • How much watering should I be supplying milkweed seeds?
  • What is the best kind of sweet corn seeds to plant in the Sedona area and when should I plant?
  • Is it necessary to cut back our red bird-of-paradise bushes in the late winter (here in Sierra Vista)? Some folks in town don’t and their red birds seem to bloom OK. Is it also necessary to cut back (or really, cut down) our Tecoma stans-orange jubilee e
  • What are the chill hours in Pima County?
  • I have a gardening question and I live in Yavapai County.

Horse

  • Can I mix orchard grass with rye grass in my horse pasture?
  • Besides a health certificate, are there any other requirements for bringing my horse into Arizona?
  • Where can I find information about rabies and horses?

Master Gardener

  • I have a gardening question and I live in Maricopa County
  • I have a gardening question and I live in Cochise County
  • I have a gardening question and I live in Yavapai County.
  • I live in Yavapai County and was a Master Gardener in another AZ county; do I need to take the class again?

Pest Management

  • How can I eliminate termites on a fence post cactus?
  • What will help keep ground squirrels away from my barrel cactus?
  • How do I kill sewer roaches in the kitchen effectively and safely.
  • How do I become a licensed pesticide applicator in Arizona?
  • My roses and bougainvillea have round holes cut in the leaves? What caused it?
  • How can we control small rodent population around our home?
  • How can I get help with bed bugs in our rental home?
  • Will borer beetles kill my mesquite tree?
  • How can I eliminate the codling moth from my red delicious apple tree?
  • Is it ok to use aloe plants' flesh if it has mites?
  • Can you help me identify tiny black beetles?
  • I have a lot of mosquitos recently indoors, can you give me suggestions on how to eliminate the mosquitos?
  • Is this an insect larvae?

Poultry

  • Is blackhead disease in chickens prominent in Pima County?
  • How do I keep my chickens cool in the summer?
  • What are the white spots on my chickens' legs?

Trees, Lawns and Landscaping

  • Overseeding Bermuda Grass
  • I need help with Chinese Elms that are showing signs of iron deficiency
  • How do I get rid of dandelions and crab grass in my lawn?
  • How can I become a Certified Landscape Professional in Arizona?
  • Where can I find information about the Campus Arboretum Tours?
  • Why is the bark on my Sumac and Jacaranda trees coming off in sheets?
  • What is the clear sticky substance dropping from my emory oak tree?
  • What is the best way to water and fertilize bermuda grass?
  • How can I become a Certified Arborist?
  • When is the best time to apply pre-emergent for weeds?
  • Do pine needles make the soil acidic for mulch?
  • How can I become a Certified Nursery Professional in Arizona?
  • What causes vertical cracks on a saguaro cactus?
  • Will borer beetles kill my mesquite tree?
  • How do I remove Purple Nutsedge from my lawn?
  • What fertilizer should I use for Bermuda and how much should I water?
  • When planting trees and shrubs do you need to score the root ball to disturb the surface and cut circling roots?
  • Is there a spray to reduce production of berries on the alligator juniper trees?
  • What can I use as a natural weed/grass killer?
  • Recommendations for fertilizing sod
  • I am looking for references about pine trees
  • Do you have recommendations for landscape designers in the Tucson area?
  • If we rent a power aerator, and plan to aerate only once per year, would it be better to aerate now, before overseeding? Or wait and aerate in the spring before the bermuda comes back?
  • What is the best time of year to apply pre-emergent herbicides in Maricopa County area?
  • Is the end of November too late to plant winter rye grass?
  • What are the chill hours in Pima County?

Water

  • Where can I get my well water tested?
  • Does UA Cooperative Extension provide water testing?
  • Does my septic tank need to be sealed or can it have a little space for air?
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