After bulb formation, the onions can tolerate heavy infestation of
thrips, especially when they are almost ready for harvest.In spring onions, the pest affects the leaf quality due to the formation of the feeding scars making the leaves to look whitened.
The reduction percentages of
thrips population development during different periods and years varied significantly (F3,111 =45.13; P= 0.0001 periods) and (F3,111= 0.83; P=0.4820 years).
The field experiment was conducted to study the activity of
thrips and their natural enemies on rose at Rizwan Sidiqui Agricultural farm near Tando Jam during 2008.
Jassid and
thrips egg count was recorded highest on NIAB non-Bt while lowest egg count was found on MNH-988.
In this mango orchard approximately 88.9% of the inflorescences presented malformation and high density of
thrips (Figure 1).
Such plant defenses reduce the ability of
thrips to penetrate the leaf and remove the sap (Milne & Walter 2000).
Adult
thrips were mounted on permanent microscope slides and identified based on Mound and Marullo (1996).
The cultivar TVU-1509 has been reported as highly resistant to flower bud
thrips (Alabi et al., 2011) and Sanzi as moderately resistant to flower bud
thrips (Abudulai et al., 2006).
Considering the data described, [y.sub.ij] is the number of
thrips observed (the response variable) of the ith plant in the jth evaluation period (the independent variable), and the real functional relationship [y.sub.ij] versus [x.sub.j] is accordingly described by the non-linear regression models in relation to the type of ground cover used.
6A); antena con 7-8 antenomeros, margen posterior del tergo VIII con peine de desarrollo variable; esternos con o sin sedas accesorias (discales); primera vena del ala anterior con una hilera de sedas generalmente interrumpida
Thrips Tres especies se hallan en ornamentales, dos en Cuba,
Thrips orientalis Bagnall y
Thrips palmi Karny (Suris & Gonzalez, 2008) y dos en Costa Rica
Thrips florum y
Thrips tabaci (Retana-Salazar et al, 2014).
Managing
Thrips on Roses with Combinations of Neonicotinoide and Biological Insecticides.
