Greenhouse white fly
Description Greenhouse white fly, also known as Trialeurodes vaporariorum is a sap feeder. The easiest way to find white flies is to brush or shake...
Category Archives: Crop protection
Crop protection is crucial to long term profitability of a commercial hydroponic farm. You need to know which chemicals to apply at the right time to ensure a high percentage of grade a product.
Pythium and Phytophthora root rot in closed hydroponic systems
Diseases of crops grown and closed hydroponic systems can be a problem and occasionally catastrophic. However, the presence of a pathogen does not necessarily mean...
Spread of viruses in greenhouses
There are various ways viruses can spread throughout the greenhouse. Transmission or method of spreading depends on the virus genes. A virus cannot move from...
Source of viruses in a greenhouse
Everyone has become more knowledgeable about the spread of viruses and the diseases they cause. Just like the COVID virus, we have to understand the...
The basic principles of a good spray program
Well planned spray programs are more effective than unplanned, random chemical applications. Have you ever considered spraying when there is no pests or diseases? Poorly...
Angular leaf spot
The disease is found in conditions if high humidity, especially in poor ventilated greenhouses or where the ventilation is not controlled properly. Optimum temperature for...
Basic pest and disease resistance management strategies in greenhouses
Resistance to chemicals is due to the intense selection pressure exerted on the population that is controlled. There is only a limited number of chemicals...
Tipburn in lettuce
Tipburn in lettuce has been a problem since the first farmer planted lettuce. Any grower will at some stage have the problem occur to some...
Lettuce deficiency and toxicity symptoms of macro and micro elements
It is often quite difficult to identify a deficiency or toxicity symptom in the field because they never really occur as a single element deficiency...
Onion thrips
Description Thrips tabaci and western flower thrips Frankliniella occidentalis are sap feeders. Common thrips as in the main image; Order: Thysanoptera, Family: Thripidae. They are...
Tomato russet mite
Description Russet mites (Aculops lycopersici, Aculus lycopersici) are so small that a 14X hand lens is needed to see them. Because of their size, these...
Plusia looper
Plusia looper description Plusia looper, also known as Cabbage looper or more correctly Trichoplusia ni are light green caterpillars with white or pale yellow stripes...
American Bollworm
Bollworm description Bollworm, also known as tomato fruit worm or American Bollworm, Helicoverpa armigera, are small caterpillars (about 30mm long, slightly more than 1 inch)...
Common physiological disorders in cucumbers
Physiological disorders caused by low temperatures Low temperatures injury only occurs with fruit that are in storage (either in transit or in storage rooms). Small...
Sweet potato whitefly
Sweet potato whitefly description Sweet potato whitefly (Bemisia tabaci, order Hemiptera and family Aleyrodidae) is a sap feeder. The adults are about 4-5mm long with...
