<i>Thrips tabaci</i> Lindeman (Thysanoptera, Thripidae) in leek: symptoms, distribution and population estimates

Theunissen, J.; Legutowska, H.

doi:10.1111/j.1439-0418.1991.tb01042.x

Cited by 12 publications

(10 citation statements)

References 11 publications

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“…In the case of thrips symptoms something similar is found. Be-fresh leek moth symptoms old leek moth symptoms cause early thrips symptoms are very difficult to spot and to identify (Theunissen & Legutowska, 1991) observers are easily confused. This results in overestimation: mean = -40.2% (sd = 77.8).…”

Section: Resultsmentioning

confidence: 99%

Observers' bias in the assessment of pest and disease symptoms in leek

Theunissen¹,

Legutowska²

1992

Entomologia Exp Applicata

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In the vegetable crop leek, Allium porrum L., the performance of observers was compared to the ‘real situation’ of pest and disease infestation. In two experiments the infestation of plants in a number of rows was meticulously investigated thus reflecting the ‘real situation’ as contrasted with the results of one or more observers. Included were the symptoms of leek moth (Acrolepiopsis assectella Zeller) feeding, both fresh and old, of onion thrips (Thrips tabaci Lindeman) feeding and of infestation with rust (Puccinia allii Rud.). The method of scouting was similar to growers' practice in commercial leek growing. The results show that even trained scouts vary considerably in accuracy when assessing infestation in rows at the same field. A group of observers show individual patterns of estimation, a wide variation in ability to make a correct assessment and a strong density dependency of deviations of the ‘real situation’ with the perceived density of the symptoms in the crop.

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Section: Resultsmentioning

confidence: 99%

Observers' bias in the assessment of pest and disease symptoms in leek

Theunissen¹,

Legutowska²

1992

Entomologia Exp Applicata

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“…Hence, damage symptoms arise largely from thrips larvae. Both larvae and adults feed within the shaft of tightly packed leaves, until the population becomes sufficiently large that the larvae are forced out to feed on the exposed, green leaves (Theunissen and Legutowska, 1991a). Therefore, damage symptoms become visible only as the plant grows and hence should be related to the level of the earlier thrips population.…”

Section: Thripsmentioning

confidence: 99%

Pest and disease management by intercropping: Suppression of thrips and rust in leek

Theunissen¹,

Schelling²

1996

International Journal of Pest Management

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Leek (Allium porrum L.) is an Important field vegetable in most of western and central Europe. Infestations of onion thrips (Thrips tabaci Lindeman) cannot be controlled with the range of insecticides now available in The Netherlands. Leek rust (Puccinia allii Rudolph) is now also difficult to control. Experiments in which no insecticides or fungicides were applied, were carried out to assess the effects on thrips populations and infection by leek rust when leek crops were undersown with subterranean clover (Trifolium subterraneum L.). To evaluate the economic aspects of this approach, both the quality and quantity of the leeks produced in the two systems were compared. Undersowing leeks with clover drastically reduced thrips infestations which was reflected in improved quality of leeks at harvest. Leek rust incidence was also reduced slightly by undersowing with clover and the quality of the leeks at harvest was also better. Although the quality of the leeks was improved when the crop was undersown with clover, the quantity of crop produced was reduced considerably as a result of plant competition.

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“…In Europe, these insects cause the most damage to cabbage, onion, and leek crops (Theunissen & Legutovska 1991). Adult and larval thrips feed on leek leaves by puncturing the cells and sucking the sap, which causes the cells to fill with air.…”

Section: Introductionmentioning

confidence: 99%

The efficacy of intercropping with birdsfoot trefoil and summer savoury in reducing damage inflicted by onion thrips (Thrips tabaci, Thysanoptera, Thripidae) on four leek cultivars

Gombač¹,

Trdan

2014

J Plant Dis Prot

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Onion thrips, Thrips tabaci (Thysanoptera, Thripidae), are an important pest of leek (Allium porrum) in Slovenia, and their control is becoming increasingly difficult for several reasons (e.g., increased resistance, specific life cycle). Therefore, intercropping, whereby the seeds of a different plant species are sown amidst the primary crop, represents a promising method to prevent pest damage. Our field experiments were conducted in 2009 and 2011, during which we studied the suitability of two different intercrops for reducing the extent of the damage inflicted by onion thrips on the leaves of four different leek cultivars. For the first time, birdsfoot trefoil (Lotus corniculatus, Fabaceae) and summer savoury (Satureja hortensis, Lamiaceae) were chosen as intercrops. Both intercrops significantly reduced the extent of damage in both years when compared to the control plots, in which an intercrop was not sown. We found no noteworthy differences among the cultivars regarding the extent of damage. We also studied the effect of these intercrops on the leek yield. Consistent with previous studies, when grown with these intercrops, the leek yield was lower than that of the control plots; however, we conclude that this reduction is acceptable in light of the advantages of intercropping, especially when utilizing birdsfoot trefoil.

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Thrips tabaci Lindeman (Thysanoptera, Thripidae) in leek: symptoms, distribution and population estimates

Cited by 12 publications

References 11 publications

Observers' bias in the assessment of pest and disease symptoms in leek

Observers' bias in the assessment of pest and disease symptoms in leek

Pest and disease management by intercropping: Suppression of thrips and rust in leek

The efficacy of intercropping with birdsfoot trefoil and summer savoury in reducing damage inflicted by onion thrips (Thrips tabaci, Thysanoptera, Thripidae) on four leek cultivars

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