Male armored scales often outnumber female scales. euonymus scale, San Jose scale) generations each year, depending on location. In this species, males are elongated and smaller, where females are oystershell shaped. This armored scale insect is native to Japan and China. Most trees and shrubs are hosts for multiple armored scale species that are tiny, cryptic and impervious to many insecticides. As a last resort, a much stronger azdirachtin product may help tip the scales in your favor (so to speak). The immature stages of the insect are called nymphs and an early mobile nymph stage is called the crawler stage. Thank you for your question.Yes, Systemic Insect Control is effective on all types of scale including euonymus scale. Thorough coverage of both the upper and lower leaf surfaces is required for spray insecticides to be effective. However, it may need to be applied several weeks before crawlers are active for best results. 2. Feeding damage first appears as yellow spots on leaves. They are members of the “true bug” insect family, along with bed bugs. In 2010, systemic neonicotinoids and spirotetramat prevented cottony cushion scale infestation 133 d after treatment whereas scale readily infested plants treated with bifenthrin and horticultural oil. Oystershell eggs typically hatch in late May or early June and the active ‘crawlers’ that emerge move about to find new sites to feed. Some of the most common scale species on woody landscape plants are obscure scale, euonymus scale, tea scale, Japanese maple scale, false oleander scale, pine needle scale and juniper scale. As a nymph, the scale is mobile, crawling around looking for new places to feed. For others, smothering young insect stages with horticultural oil is the best control. However, natural enemies may not provide enough mortality (‘killing power’) to substantially impact “high” populations of euonymus scale. I treated it this year with Bayer Advanced Tree & Shrub Treat & Feed Annual application. These insects secrete a waxy covering – that gives them their common name – to protect them from the environment and predators. It is very effective against soft scale insects such as calico scale. 122 Sadof and Sclar: Oil and Systemic Insecticide Effects on Euonymus Scale March March March March April Figure 1. Euonymus scale – Look for euonymus scale on leaves and stems of Euonymus spp. Individual scales are small and are often overlooked until serious damage has occurred. Each species has a different host range and life cycle. Newly hatched crawlers are the easiest to control with contact insecticides. This is because of morphological traits that protect them from contact insecticides. The development of chemicals which may be absorbed into the plant and translocated has provided a new way to control some Euonymus scale male small white covers on euonymus. Once we diluted it as instructed, the smell was still present but not as bad. The most common species of armored scales in urban landscapes are tea scale on camellias and hollies (figure 12), false oleander scale on … Treating Scale: The waxy coating on these insects prevents insecticide sprays from having a substantial effect. Hunt at garden centers for a systemic insecticide containing disulfoton (Bonide Systemic Granules is one). If you don’t catch them at that time, a spray will not work as they exude a waxy substance which covers them and protects them from outside elements. imidacloprid, a popular systemic insec-ticide (discussed below), controls soft Systemic insecticides such as imidacloprid can also be used for control. 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