| 41. | He specialized in studying the armoured scale insects.
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| 42. | Isopropyl alcohol ( rubbing alcohol ) is effective as a topical insecticide, particularly on scale insects.
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| 43. | Susceptible to scale insects and red spider mites.
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| 44. | Scale insects, tiny bugs that feed on the sap of trees, are another favorite ladybug meal.
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| 45. | Mortality of scale insects ( caused by natural enemies ) can be double with insectary plantings.
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| 46. | The red pigment carmine is produced from powdered bodies of scale insects, so some vegans avoid it.
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| 47. | Some types of scale insect are economically valuable for the substances they can yield under proper husbandry.
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| 48. | The ministry said the pests appeared to be either aphids or scale insects, not the pink mealybug.
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| 49. | In order to obtain all the nutrients they need, the scale insects ingest large quantities of sap.
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| 50. | Beech bark disease is a fungal infection that attacks the American beech through damage caused by scale insects.
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