STUDIES ON ”HE INSE(;T FAUNA ON BOO’MH BROOM
TABLE XIX
Rxperim.en,tu t9 determine thr? preferred mipaition sites of
Chcaias legatella (Mukings, N5G)
123
No. of experiments
No. femelee in each experiment
Ovipoeition sites
1. In grooves
(a) Living broom - etem grooves
twig mils
leaf a i l s
between leavee
on seed poda
between leaf and twig
4
1
2
6
1
2-3
Totd egga per mite
636
12
41
132
85
21
-
-
15
4
1-2
24
127
8
28
-
-
-
twig exile
-
-
-
(c) Elsewhere
-8dk wpeu twigs
-
-
-
-
(a) Living broom - twig
22
3
2. o n rrmooth surfaaea
-
-
-
-
-
leaf
7
2
40
@) Elsewhere
- muslin floor
oelluloid aid40
muslin sides
wooden floor
-
-
-
-
chemoreceptors were involved. Other factors which elicited further
stages in oviposition behaviour were tactile and involved “testing” the
dze of the twig and that of the crevice. Twigs of 1 -6 mm diameter were
preferred and shallow crevices 0.6 mm wide; them accommodated the
width of an egg and the maximum width of the tip of the ovipositor
(0.41 mm). The moths reaponded to “twig size” in the absence of broom
or of its odour, but only if crevices of suitable size wem available. The
response to crevices could be elicited in the absence of all the other
stimuli. Makings (loc. cit.) suggests that the presence of an egg in the
vestibulum corresponds to the “condition of readiness to lay” and subdivides the oviposition behaviour of C. legatella into the following stages:
1. A gravid female in “condition of readinese to lay” shows searching
2. This is followed by “orientation” or detection of the plant; probably
3. The broom twigs are then palpated with antennae.
4. The next stage is “testing” or selection of the “twig size”.
6. This is followed by searching with the ovipositor for a crevice.
6. The search is followed by “testing of the crevice size”, presumably
tactile receptors on the ovipositor are involved.
7. This chain of reactions culminates in oviposition.
-
-
-
-
-
-
Pod
-
-
-
-
-
-
-
activity in the preeence of broom odour.
the chemoreceptors on the tarsi and antennae are implicated.
TABLE XIX
Rxperim.en,tu t9 determine thr? preferred mipaition sites of
Chcaias legatella (Mukings, N5G)
123
No. of experiments
No. femelee in each experiment
Ovipoeition sites
1. In grooves
(a) Living broom - etem grooves
twig mils
leaf a i l s
between leavee
on seed poda
between leaf and twig
4
1
2
6
1
2-3
Totd egga per mite
636
12
41
132
85
21
-
-
15
4
1-2
24
127
8
28
-
-
-
twig exile
-
-
-
(c) Elsewhere
-8dk wpeu twigs
-
-
-
-
(a) Living broom - twig
22
3
2. o n rrmooth surfaaea
-
-
-
-
-
leaf
7
2
40
@) Elsewhere
- muslin floor
oelluloid aid40
muslin sides
wooden floor
-
-
-
-
chemoreceptors were involved. Other factors which elicited further
stages in oviposition behaviour were tactile and involved “testing” the
dze of the twig and that of the crevice. Twigs of 1 -6 mm diameter were
preferred and shallow crevices 0.6 mm wide; them accommodated the
width of an egg and the maximum width of the tip of the ovipositor
(0.41 mm). The moths reaponded to “twig size” in the absence of broom
or of its odour, but only if crevices of suitable size wem available. The
response to crevices could be elicited in the absence of all the other
stimuli. Makings (loc. cit.) suggests that the presence of an egg in the
vestibulum corresponds to the “condition of readiness to lay” and subdivides the oviposition behaviour of C. legatella into the following stages:
1. A gravid female in “condition of readinese to lay” shows searching
2. This is followed by “orientation” or detection of the plant; probably
3. The broom twigs are then palpated with antennae.
4. The next stage is “testing” or selection of the “twig size”.
6. This is followed by searching with the ovipositor for a crevice.
6. The search is followed by “testing of the crevice size”, presumably
tactile receptors on the ovipositor are involved.
7. This chain of reactions culminates in oviposition.
-
-
-
-
-
-
Pod
-
-
-
-
-
-
-
activity in the preeence of broom odour.
the chemoreceptors on the tarsi and antennae are implicated.