{"id":111,"date":"2026-02-06T19:29:33","date_gmt":"2026-02-06T19:29:33","guid":{"rendered":"https:\/\/www.coltivobio.com\/en\/?p=111"},"modified":"2026-02-25T09:08:10","modified_gmt":"2026-02-25T09:08:10","slug":"whitefly-greenhouse","status":"publish","type":"post","link":"https:\/\/www.coltivobio.com\/en\/whitefly-greenhouse\/","title":{"rendered":"Whitefly (Trialeurodes and Bemisia): Damage and Control"},"content":{"rendered":"

The whitefly (also known as greenhouse whitefly) is a phytophagous insect that, under certain conditions, is very difficult to control. In this technical factsheet, we will examine the damage, control strategies, biological cycle, and natural remedies against Trialeurodes vaporariorum<\/em> and Bemisia tabaci<\/em>.<\/strong><\/p>\n

\"Adult
Figure 1 \u2013 Whitefly colony on a young zucchini plant<\/figcaption><\/figure>\n

Identification and damage caused by whitefly<\/strong><\/h2>\n

Whiteflies are insects belonging to the order Hemiptera<\/strong>, family Aleyrodidae<\/strong>, and are easy to recognize due to their characteristic appearance. Among the various aleyrodid species, the two most important in horticulture are Trialeurodes vaporariorum<\/em><\/strong> and Bemisia tabaci<\/em><\/strong>.<\/p>\n

Adult whiteflies resemble small gnats (hence the common name \u201cwhitefly\u201d), are no more than 2 mm long<\/strong>, and have two large white wings<\/strong> that cover the entire body, leaving only the yellow head<\/strong> visible (see Figures 1 and 2).<\/p>\n

\"Adult
Figure 2 \u2013 Typical appearance of an adult whitefly: note the white wings and the yellow thorax and head<\/figcaption><\/figure>\n

The juvenile stages are called nymphs<\/strong>, which appear as small, oval, scale-like plates with tufts of hairs or setae<\/strong> that may be more or less pronounced. This feature is difficult to see with the naked eye but allows morphological differentiation between the two species (see Figure 3).
When disturbed, adult whiteflies take flight in large numbers, moving in a zig-zag pattern and quickly seeking shelter in surrounding vegetation within a 20\u201330 cm radius<\/strong>.<\/p>\n

Damage is caused mainly by the production of honeydew<\/strong> by both nymphs and adults. Honeydew contaminates leaves and fruits, leading to reduced market value<\/strong>, decreased photosynthetic activity<\/strong>, and the development of sooty mold<\/strong> (growth of saprophytic fungi on leaf surfaces).<\/p>\n

Whitefly infestations can easily escape early detection and result in severe damage<\/strong>. In addition, aleyrodids are vectors of several plant viruses<\/strong>. Host plants include many species such as tomato, zucchini, pepper, poinsettia, gerbera, chrysanthemum<\/strong>, numerous Solanaceae<\/strong>, Cucurbitaceae<\/strong>, and many ornamental plants.<\/p>\n

You may also be interested in our technical factsheet on: <\/strong>\u201cHow to control tomato leaf miner using biological methods\u201d<\/em><\/a><\/p>\n

\"Whitefly
Figure 3 \u2013 Whitefly nymphs observed under a stereomicroscope. Note the presence of setae, which\u2014based on their length\u2014allow identification as Trialeurodes vaporariorum<\/figcaption><\/figure>\n

Biological cycle of whitefly<\/strong><\/h2>\n

In warm environments or under greenhouse conditions, both Trialeurodes vaporariorum<\/em> and Bemisia tabaci<\/em> can reproduce continuously or overwinter outdoors on wild host plants.<\/p>\n

The biological cycle includes the following stages: egg<\/strong>, nymphs (four instars)<\/strong>, pupa<\/strong>, and adult<\/strong>. Eggs are laid in clusters and have an elongated flask-like shape ending in a point<\/strong> (see Figure 4). Egg color is initially white<\/strong>, turning dark brown<\/strong> as they mature. Eggs are very small and not visible to the naked eye<\/strong>, requiring observation under a stereomicroscope.<\/p>\n

\"Whitefly
Figure 4 \u2013 Whitefly eggs showing the characteristic flask-like shape<\/figcaption><\/figure>\n

Biological control and management of whitefly<\/strong><\/h2>\n

There are no truly effective home-made natural remedies<\/strong> against whitefly, despite the many \u201cmiracle recipes\u201d found online based on garlic, nettle extracts, and similar substances. Whitefly is a highly specialized insect<\/strong>, capable of rapid reproduction and of developing resistance even to chemical insecticides<\/strong> due to its genetic adaptability. Therefore, it cannot be controlled with improvised home remedies.<\/p>\n

Garlic macerates, in particular, are not recommended<\/strong>, as no authoritative plant pathology texts or experienced agronomists recognize them as an effective control method for whitefly.<\/p>\n

Effective management relies on integrated agronomic strategies<\/strong> using proven tools. First, yellow sticky chromotropic traps<\/strong> are useful for detecting whitefly presence in the field and for assisting in direct control, as many adults are captured by these traps.<\/p>\n

The following active ingredients can be used for control:<\/p>\n