Arborjet Revolutionary Plant Health Solutions

Aphids

Aphids are soft, pear-shaped insects that have long legs and antennae with tube-like structures called “cornicles” that protrude out of the hind end of the body. This family of insects contains most plant virus vectors (around 200 known) such as the green peach aphid. They can appear in a range of colors including green, yellow, brown, red, or black. Their color will depend on the plants that they are currently feeding on but the most commonly recognized aphids are green or black. Some aphids secrete a waxy or woolly substance on their bodies that can make them easy to identify. Most aphid populations are particularly high in the spring and fall seasons.

 

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Symptoms

Low to moderate numbers of leaf-feeding aphids are not usually damaging in gardens or on trees; however, large populations can turn leaves yellow and stunt shoots. Aphids can also produce large quantities of a sticky substance called honeydew, which turns black from opportunistic growth of a sooty mold fungus. Some aphid species inject a toxin into plants, which causes leaves to distort and inhibit their growth.

 


A: White pine aphid
B: Leafcurl ash aphid on green ash
C: Giant conifer aphids on juniper
 
Photo A taken by: William H. Hoffard, USDA Forest Service, Bugwood.org
Photo B taken by: Whitney Cranshaw, Colorado State University, Bugwood.org
Photo C taken by: Whitney Cranshaw, Colorado State University, Bugwood.org
 
 

Treatment

 

Aphids are easily managed with either IMA-jet or ACEjet. IMA-jet will provide season-long control. Treat trees susceptible to aphid infestation in the spring with IMA-jet at rates of 2 to 4mL per inch diameter. Infestations of aphids late in the summer can also be treated with IMA-jet, but often a shorter residual product such as ACE-jet is appropriate.

When to Treat

 

An IMA-jet treatment early in the lifecycle of aphids is very effective and provides season-long control. Later season infestations or higher populations that require rapid control respond well to ACE-jet unless growing conditions extend more than 60 days, in which case a combination of ACE-jet followed by a low- medium rate of IMA-jet will provide good control. In the case of chemical-sensitive areas, the use of Eco-Mite Plus™ and AzaSol™ will provide suppression on a two-week application schedule. Generally, the best seasons for injection are spring and fall, since uptake occurs when trees are transpiring. The environmental conditions that favor uptake are adequate soil moisture and relatively high humidity. Soil temperature should be above 40°F for trunk injection. Hot weather and/or dry soil conditions may slow translocation of product into foliage so water trees before and after treatment application. The addition of a soil surfactant, such as NutriRoot, as a drench or sub-surface soil injection will encourage water to move deeper into the soil and increase moisture availability to the tree over time. If treating trees in the summer, inject in the morning for the quickest uptake.

What to Expect After Treatment

 

Trunk injections of IMA-jet will distribute upwards in the canopy within a day or so under adequate soil moisture conditions. Severe drought or inadequate irrigation coverage may slow down the translocation into foliage so tree owners should be advised to provide the necessary water prior to treatment. The addition of a soil surfactant such as NutriRoot™ as a drench or sub-surface soil injection will encourage water to move deeper into the soil and increase moisture availability over time. If a rapid response is more desirable, the use of ACE-jet will move more quickly into the foliage but does not have the residual of IMA-jet.

Click on the video link below to watch Eco-Mite Plus in action against aphids!

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Uploaded: 10/12/2015

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