A network that helps people worldwide obtain rapid advice and information on crop protection, including the identification and management of plant pests.
PestNet is a network that helps people worldwide obtain rapid advice and information on crop protection, including the identification and management of plant pests. It started in 1999. Anyone with an interest in plant protection is welcome to join. PestNet is free and is moderated, ensuring that messages are confined to plant protection.
Crops > Roots & tubers > Potato > Spread of thrips diseases to the Pacific islands
April 2016. Australian scientists are looking at the possibility that winds cold carry phyllids from New Zealand (see below) across the Tasman to Australian and beyond. A member asked a question about the possibility of IPM being used to control the psyllids should spread occur.
This was the reply from a scientist with Plant & Food Research.
(1) Some crops are more susceptible than others. Some chilli varieties do not need to be sprayed with insecticide. Yet it is impossible to have complete loss of unsprayed (and even sprayed) potato and tomato crops! So, grow tolerant crops, be it chilli, capsicum and eggplant, rather than tomato or potato crops.
2) There are very important naturally occurring foliage dwelling predators of TPP in New Zealand. They are brown lacewing (Micromus tasmaniae) and a hoverfly species (Melanostoma fasciatum, called small hoverfly). Plus spiders are important predators on seedlings. In New Zealand, there may be up to 200 predators per large plant (mainly hoverfly eggs and larvae) and they can control all small pest infestations such as TPP, aphids, thrips and small caterpillar pests. So, grow crops and border crops that are good reservoirs for these important predators. Lacewings do not require a major reservoir crop, but hoverflies do. Plant long-flowering crops near commercial crops to get much higher populations of hover fly larvae in the crop. Also, predators thrive on potato plants, but are not common on tomato plants (predators don’t like the hairy leaves of tomatoes).
3) There are also some insecticides that are recommended that have less impact on important natural enemies; they are used when action thresholds are exceeded on tomato and potato crops.