What is a sweep net used to sample?
Sampling with a sweep net is commonly used to monitor many alfalfa pests when alfalfa plants are at least 6- to 10- inches tall. (For shorter regrowth, do not rely on sweep net sampling to determine pest numbers; instead estimate plant damage visually).
How do you sweep alfalfa for bugs?
Sweep net sampling: A standard 15-inch-diameter sweep net (Fig. 43) can be used to sample foliage-feeding caterpillars, alfalfa weevil larvae, and plant bugs in alfalfa: While walking through the field, take 10 consecutive 180-degree sweeps. Swing the net from side to side with each step.
What is one advantage of a sweep net?
sweep net A finely meshed net, usually with a round mouth, used for sampling insects from vegetation. Its advantages lie in its simplicity and speed, and its ability to collect relatively dispersed insect species on top of the vegetation. It cannot be used on very short vegetation.
How do you test alfalfa for bugs?
Spring growth
- Estimate the percentage of terminals injured by alfalfa weevil and check for live larvae.
- Do a sweep net sample for pea aphid. If abundant, do a stem sample.
- See if unusual numbers of spittlebug nymphs, plant bugs, grasshoppers, cutworms or other occasional pests are present.
What is the meaning of sweep net?
Definition of sweep net 1 or sweep seine : a large fishing net usually paid out around an arc of a circle from a boat and then hauled ashore. 2 : a bag-shaped net with a handle used by entomologists for catching insects by sweeping it over vegetation.
How do you control alfalfa weevil?
1), or biological control. Whenever possible, harvest the first cut early for hay or silage. If the field is within 10 days of a normal harvest, cut the crop for alfalfa weevil control. Harvest the alfalfa field before the fourth-stage larvae can cause damage.
What kind of bugs eat alfalfa?
Alfalfa weevil (Hypera postica Gyllenhal) and Egyptian alfalfa weevil (H. brunneipennis Boheman) are the most important insect pests of alfalfa in California (Color Plate 9.1). The two species are very similar; the appearance of the adults and larvae is identical.
What is one disadvantage of a sweep net?
Sweep nets have a fairly well-defined height range at which they work best, they are not good at sampling very short grass and once the vegetation gets over 30 cm you start to miss a lot of the insects associated with it as the net doesn’t reach that far down. Also the efficiency of the sweep netter is reduced.
What kind of insects can be collected using sweep net?
Sweep Net Catches Depending on the habitat/field that you are sweeping, weevils, plant bugs, leafhoppers, beetles, spiders, wood wasps and snails are all commonly caught in a sweep net. You get great results with a sweepnet going through short vegetation such as grass, nettles and reeds.
How much is a sweep net?
Insect Collecting Net with Extendable Rod – Insect Sweep Net – Insect Catching Net – HARPALSONS at Rs 1300/piece | Insect Nets | ID: 22674683212.
What do you spray for alfalfa weevil?
EARLY-SEASON WEEVIL LARVAL PRESSURE If an abundance of larvae are present early in the season with minimal alfalfa growth (<6 inches) and several weeks left before harvest, one recommended approach is to knock down larval populations with a pyrethroid or an organophosphate and follow with Steward EC insecticide.
What size net do I need to use to sweep?
Sweep nets are used for sweeping insects out of riparian vegetation. We suggest you use a net with a 38-cm net ring, 91-cm handle, and white muslin bag.
What is a sweep net?
Sweep nets are swung from side to side through the grass and then inverted to observe what is present. R. Edward DeWalt, John B. Sandberg, in Thorp and Covich’s Freshwater Invertebrates (Fourth Edition), 2015
What is the best sampling protocol for carrot leafhoppers?
Sequential sampling protocols have been developed for sweep net sampling in carrot (O’Rourke et al., 1998 ). Yellow-sticky traps are also useful and easy to use. Light traps equipped with fans for suction also have been used effectively to capture leafhoppers.
What is the difference between sweep net and aerial net?
Aerial nets are fitted with a long, fine mesh net on a longer handle than is found on a robust sweep net. Most stoneflies are generally erratic, clumsy fliers and spend little time in the air. However, adults will fly to the stream to drink or lay eggs (Poulton and Stewart, 1988 ).